Pokémon Red and Green beta
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This article lists the development leftovers and unused content of the Japanese and EnglishGeneration I gamesPokémon Red and Green,Pokémon Blue, andPokémon Red and Blue that have been documented by fans.
Global information
Pre-release

No Mew present
According to the interview bySatoru Iwata withTsunekazu Ishihara andShigeki Morimoto about the release ofPokémon HeartGold and SoulSilver, localized asIwata Asks, they admitted that after thedebugging tools were removed, they addedMew in the remaining space on theROM.Nintendo thought that this would have been risky because altering the internal data after completing the testing period meant that any newbugs and/orglitches created by adding data without recurring to debugging tools would have been much harder to fix. Standardprogramming practices usually discourage altering thesource code and not testing it just before releasing thesoftware to the customer.[1]
Poké Balls
- Main article:Poké Ball
Some concept art depictsPoké Balls on the ground, in two pieces. This is most likely just a carryover from when Pokémon was still the concept ofCapsule Monsters. Strangely, the original Poké Ball sprites fromPokémon Red and Green lack the button in the center of the Poké Ball.
Rebattling Trainers
In an interview withShōko Nakagawa in her bookShōko Nakagawa: Pokémon Taught Me The Meaning of Life,Tsunekazu Ishihara revealed that originally, the game was programmed to trigger a battle with each Trainer any time the player walked by them, regardless if the player had already defeated them in battle previously. Thewild Pokémon encounter rate was also significantly higher originally. The Trainer rebattling was omitted from the final release and the wild Pokémon encounter rate was significantly reduced.[2]
Release date
The games were originally scheduled for a December 21, 1995 release, according to an old Nintendo of Japan flyer.[3] This could explain the copyright year of 1995 that appears in the games' introductory sequence, and all subsequent games and official merchandise.
Prerelease border
On page 153 of the December 1995 bookNew Game Design byGame Freak is a summary ofRed and Green's final plot. Two screenshots of the game are shown which use an unseen border resembling aSuper Game Boy border. In it, "POCKET MONSTERS!" is written in a different size. The border has more Pokémon on it than the Super Game Boy borders from the final game.Clefairy andPidgey are included, suggesting the screenshot may be from Japanese Red.Kangaskhan does not appear in the border.
- Title screen screenshot from New Game Design.
- Battle screen screenshot from New Game Design.
- Final game's Super Game Boy border for comparison.
Post-release
Concept art

During a gaming exhibition calledGame On, early concept art ofCapsule Monsters byKen Sugimori was featured, along withpre-release material fromPokémon Ruby and Sapphire. The concept art depicts rough versions of various concepts that made it into the final releases of theGeneration I games. They seem to include variousbattles, theSafari Zone,Red riding on aLapras, aBlastoise,Celadon City,Silph Co., and a town with a fountain which could have been reworked intoCeladon City. Some otherPokémon are identifiable in a raw or semi-normal form, such asGastly, and others are prototypical of an entire class of Pokémon, such as a basicDragon-type.
GameCenter CX
| This section is incomplete. Please feel free to edit this section to add missing information and complete it. Reason: Expand based on the information provided by Satoshi Tajiri, if applicable |
A Japan-exclusive special Pokémon episode ofGameCenter CX, known asRetro Game Master outside of Japan, included an interview withSatoshi Tajiri, where he revealed earlyPokémon character profiles ofNidoking,Slowbro andKadabra. Notably, they are given aNational Pokédex number which matches theirinternal index number, rather than their finalKanto Pokédex number. Nidoking, for instance is noted as being #007, rather than #034, either suggesting that there was another method of ordering the Pokémon proposed, or that they reflect their ordering in the internal data. The latter is supported by interviews withKen Sugimori, which verify thatRhydon, which has an index number of 001, was the first Pokémon ever created, and early sketches fromCapsule Monsters featuring Rhydon. Nidoking is also referred to asマイコー♂Maikō♂, indicating that there were either placeholder or alternate names for Pokémon before the development ofPokémon Red and Green had finished.
Professor Oak battle
- Main article:Unused Trainer data →Prof. Oak

Unused Trainer data for Prof. Oak (Japanese:オーキドせんせいTeacher Oak) exists in all Generation I games.
Prof. Oak has data for three different teams using differentfirst partner Pokémon, with each Pokémon being lv66-70, higher thanBlue'sChampion battle team. It is possible he was meant to be a late-game opponent, perhaps similar toRed inGeneration II.
He can be battled by exploiting certain glitches.
Bird type
- Main article:List of glitch types in Generation I
TheBird type may have been a prototype for theFlying type. This can be seen in the final releases:MissingNo. is recognized as a dual-typeBird/NormalPokémon. The Bird type is present in the internal data of theGeneration II games, possibly due to their engine being an upgraded version of that of theGeneration I games.
Directions
Unused text strings within the game show option dialogs forNorth/West (Japanese: きた/にしNorth/West),North/East (Japanese: きた/ひがしNorth/East), andSouth/East (Japanese: みなみ/ひがしSouth/East). These do not appear in the final release, with the only in-game option dialogs beingYes/No (Japanese: はい/いいえYes/No) andHeal/Cancel (Japanese: あずける/やめるHeal/Cancel).[4][5] (For unknown reasons, there is no unusedSouth/West (Japanese: みなみ/にしSouth/West) option dialog.)
Unused Trainer class
- Main article:Glitch Trainer

ATrainer class known asChief (Japanese:シルフのチーフSilph's Chief) was omitted from the final releases, though likeProfessor Oak, abattle with anNPC with this data can be accessed through modification of the internal data or saved game data as well by cheating. It is apparently mentioned in-game by one of theTeam Rocket Grunts inCeladon City, and shares its battle sprite with theScientist Trainer class since its index number of0xE3 precedes it (Scientist's is0xE4). He has no defined roster, instead using the one for the first Scientist on the internal list. Also like Professor Oak, he has no preset dialogues programmed in either for before the battle or after defeating him.[5]
Its Japanese name suggests that the President ofSilph Co. was originally planned as aTrainer that could be challenged to battle.
Unused Trainer actions
There is unused data within the games for trainers to use various items that goes unused.[6]
Extra field move
An extrafield move might have been planned as there is an unused entry betweenFly andSurf within the internal data. It could also have been anHM as it is placed between the aforementionedHM02 andHM03 and all HMs are ordered by number in the internal data. Given its index number of0xB4 and that the highest index number used for actual moves is0xA5, other moves beyond the 165 introduced inGeneration I were once planned as well.[5]
The unused text string "Ground rose up somewhere!" (Japanese: どこかでじめんがもりあがった!) might be related to this scrapped field move.[7]
Music
An unused track has been discovered in the internal data. The music is originally high-pitched and incomplete as only the individual audio channels are left. There have also been attempts at recreating what the full theme would sound like.
- Original music
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- Recreation attempt
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Locations
- Main article:List of locations by index number in Generation I
There are threemap locations which are each identical to another map used in the final releases, except for the fact that the default theme used in the alternative location is different.[8]
- The house invaded byTeam Rocket inCerulean City: has index number
0x45instead of0x3Eand playsCaves of Mt. Moon - TheUnderground Path's entrance atRoute 6: has index number
0x4Binstead of0x4Aand playsVermilion City Theme - ThePoké Mart atCinnabar Island: has index number
0xADinstead of0xACand playsCinnabar Island Theme
In addition, 25 deleted map locations with leftover header data are present in the internal list of location index numbers.
- Three use theVictory Road map header (index numbers
0x69-0x6B) - 17 use thePokémon League map header (index numbers
0x6D-0x70,0x71-0x75and0xED-0xF4) - One uses thePokémon Tower map header (index number
0x94). - Three use theRocket Hideout map header (index numbers
0xCC-0xCE). - Another uses theRock Tunnel map header (index number
0xE7).
Formatted data exists for an additional map location.[9] It is located straight after the final town in memory (Saffron City) but just beforeRoute 1. Its associated data is completely blank, even its header data and coordinates on theTown Map (as it is set as being part ofPallet Town, with coordinates (0,0)), except for the fact that an unused flag when checked allows theplayer toFly to it. Attempting to travel to this location simply freezes the games.
There is an unused warp tile inCeladon City.[10] It is internally programmed in to lead to 5F ofCeladon Dept. Store, which in turn has its internal data located away from the data for the other floors, possibly suggesting that it was originally a completely different map in earlier stages of development, which is supported by the aforementioned discovery.
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A part of the internal data relates to aPoké Mart placed between the data for theFuchsia andCinnabar Poké Marts and may be associated with the formatted map location as mentioned above. The item list containsGreat Balls,Super Potions,Hyper Potions,Full Heals andRevives.
Items
- Main article:List of unobtainable items
Regularly unobtainableKey Items with the names of all theBadges exist in the internal data (index numbers0x15-0x1C). This could mean that the Badges were originally going to be items that were carried in theplayer'sBag; however, as Key Items, they appear to be actually used in the list of Badges presented by theGym Badge man inCerulean City.[11] The BoulderBadge (index number0x15) and CascadeBadge (index number0x16) are the only ones that do something when used inbattle—they allow the player to throwBait and Rocks, respectively, as in theSafari Zone battles. When used in the overworld (except dungeons andcaves), it changes the background music to a single channel of道案内Guidance; if used in a dungeon or cave, it changes the background music to a single channel of ~オープニング~~Opening~. This is due to the function that plays the "throw Bait or Rock" sound effect attempting to load it but referring to the wrong soundbank.
Key Item????? (index number0x07) enables theplayer toSurf without using aPokémon.Badges are not required either. Due to this ability, it is often referred to asSurfboard. In the final releases, themove Surf can be used by a Pokémon as afield move serving the same function. It may indicate that Surf was not originally implemented as a field move or that this is a debugging item used by the programmers. Unlike the move Surf, it also allows surfing onRoute 17's Cycling Road and does not trigger the "Cycling is fun! ForgetSurfing!" (Japanese: せっかくのサイクリング!⋯⋯なみのりはやめとこう) message.
ThePokédex is also present as a Key Item with index number0x09 and can be accessed during battle, much likeAsh does inPokémon the Series. It also causes theVRAM to load the overworld tileset and turns the HP bar to letters when used in battle.
Coin is programmed in as regular inventoryitem, having index number0x3B. It cannot be used for slot machines or price exchanges, rendering it completely unusable. It will stack if multiple Coins are obtained; however, it is not stored by theCoin Case. It can be sold for$5 each at anyPoké Mart and bought for$10 each from a Poké Mart with a modified item list. Actual Coin Case-stored Coins are available for double the price, at$20 per Coin, and cannot be sold. In theTrainer's Guide (manual) ofPokémon Red and Blue, it is listed as a "miscellaneous item"; thus, it is the only item to be included in this category.[12]
TMs 51-55 (index numbers0xFB-0xFF) were planned and contain eachHM's respective field move by order. They stack as any other TM and can be sold at Poké Marts.[5]
- TM51 teachesCut likeHM01; can be sold for$1500 and bought for$3000
- TM52 teachesFly likeHM02; can be sold for$7000 and bought for$14000
- TM53 teachesSurf likeHM03; can be sold and/or bought for$0
- TM54 teachesStrength likeHM04; can be sold for$4000 and bought for$8000
- TM55 teachesFlash likeHM05; can be sold for$2000 and bought for$4000. Also appears asCancel (Japanese: やめるCancel) and hides items below it; this secondary effect might be due to its index number (
0xFF), which puts it at the bottom ofthe item list in the internal data.
Another Key Item named????? (index number0x2C) and a fakePP Up (index number0x32) exist and are completely useless. The fake PP Up can be sold for$4900 and bought for$9800, unlike the real PP Up, which is sold and/or bought for$0.
Sprites

Different front sprites ofPokémon were planned forPokémon Blue, notably the ones forRaticate,Rhydon,Ditto,Dragonair andMewtwo. These were featured in the November 1996 issue ofCoroCoro Comic, which published general information about the game.[13]
Cries
CertainMissingNo. use specific leftovercries.[5][14]
- Cries with index numbers
0x43(Base 0, Pitch 128, Length 16),0x45(Base 29, Pitch 244, Length 64), and0x4F(Base 34, Pitch 255, Length 64) do not appear to resemble the cry of any actualPokémon. - Cry with index number
0x51(Base 14, Pitch 224, Length 96) resemblesPidgey's cry, cries0x5E(Base 15, Pitch 64, Length 192) and0x89(Base 15, Pitch 64, Length 128) resembleDragonair's; cry0x5F(Base 15, Pitch 32, Length 192) resemblesVenusaur's and cry0x7F(Base 17, Pitch 32, Length 16) resembles eitherVaporeon's,Jolteon's orFlareon's cries. - Cry with index number
0xB5(Base 29, Pitch 0, Length 128) is modified fromZubat's but resemblesCrobat's, suggesting that the Pokémon might have been originally planned forGeneration I instead ofGeneration II.
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Text
- Main article:List of items by index number in Generation I
Unused text strings referring toBadges and titles exist in the Japanese versions, but were not translated for the localizations. The katakana used for thegairaigo (loanword) of "badge" is also slightly different, being バッヂBaddji instead of バッジBajji.[5] These names appear in the internal item list of the Japanese versions on offsets0x4A92-0x4B08, which would suggest that they areitems; however, they do not have valid effects if they are forcedly used as items. The most likely scenario is that these names originally belonged to different multiple lists.
- かみなりバッヂLightning Badge
- Not to be confused with theThunder Badge, which is named オレンジバッジOrange Badge in Japanese.
- かいがらバッヂShell Badge
- おじぞうバッヂJizo Badge
- A possible reference to the Japanese variation ofKsitigarbha, known as Jizo.
- はやぶさバッヂFalcon Badge
- ひんやりバッヂCool Badge
- なかよしバッヂFriendship Badge
- バラバッヂRose Badge
- ひのたまバッヂFireball Badge
- ゴールドバッヂGold Badge
- ゴールドバッジGold Badge is actually the Japanese name of theMarsh Badge.
- たまごEgg
- ひよこChick
- ブロンズBronze
- シルバーSilver
- ゴールドGold
- プチキャプテンLittle Captain
- キャプテンCaptain
- プチマスタLittle Master
- マスターMaster
Default player and rival names
The unused default name for Red in the English versions isNinten whileBlue's isSony. While it is impossible to view these names during regular gameplay, changing a fewmemory addresses inRAM can allow for these names to appear as shownhere. This references the fact that in the years surrounding the releases of the Generation I games, Sony was Nintendo's main competition. Ninten is also the default name of the main protagonist ofMother, a game developed byCreatures, Inc., which has worked on thePokémon games since the start.
In the Japanese versions, the unused default names for Red and Blue differ betweenPokémon Red and Green andPokémon Blue:[15]
- In Pokémon Red and Green, Red's unused default name is やまぐちYamaguchi while Blue's is いしはらIshihara. Yamaguchi refers to Wataru Yamaguchi, an art director that worked on the original games, while Ishihara refers toTsunekazu Ishihara, the current president andCEO ofThe Pokémon Company and who was the games' producer at the time.
- In Pokémon Blue, the unused default names for Red and Blue are, respectively, ゲーフリGēfuri, an abbreviation ofGame Freak's name in Japanese (ゲームフリークGēmu Furīku), and クリチャKuricha, a reference toCreatures, Inc.
Unused in-game trade
- Main article:In-game trade
AButterfree-for-Beedrillin-game trade was originally planned.[16] The Beedrill's nickname inPokémon Red and Green is ピピんPipin and チクチクChikuchiku inPokémon Blue. This explains why the international releases contain unused text strings referring to a Beedrill nicknamedChikuchiku.
Safari Zone hidden PCs
Unused coding leftover in the game shows that three specific house maps (DF,E0, andE1) contain data for Pokémon Center PCs in the same location PCs would be located in a Pokémon Center.Teleport checks where the last location of a Pokémon Center was and if it sees that it was a Safari Zone rest house, will not teleport you to that location. The invisible PC data was later removed inPokémon Yellow releases.[17]
Unobtainable Nugget in Safari Zone entrance
If the Itemfinder is used at the Safari Zone entrance, it will say an item is nearby but it cannot be obtained without cheating.
Unused Elite Four walking sprites
There is sprites for the four members of theElite Four walking but as they all stand still, the sprites never get to be seen.[18]
Super-effective Dragon type
TheDragon type is super effective against itself in Generation I. However, due to the only Dragon-type move,Dragon Rage, always dealing exactly 40 damage, this behavior never gets to be seen.
Unused move effects
There are unused effects for moves, the only effect to go used is23 as the effect was assigned toBlizzard in the original Pokémon Red and Green.
Unused Trainer partiesThere are a number of Trainers with teams that are never referred to or called on in the game data that are leftover.[19]
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