Thisgiant Onix was first seen rampaging wildly aroundMt. Hideaway.Ash andhis friends were on the Onix's trail and got chased. The chased ended after they hid behind a rock. Later, it rose from the ground and encounteredTeam Rocket. Team Rocket fired a net at Onix which got it angry. Team Rocket retreated to a cave and Onixtackled the cave.
Ash,Misty, andBrock sent outSquirtle,Staryu, andOnix respectively to battle the giant Onix but didn't succeed. Ash fell from the cliff and Onix was about to attack him, butBruno appeared and saved Ash from the attack. He was ready to catch Onix. When Ash and the others asked what Pokémon he was going to use, Bruno shocked them by explaining that he wasn't going to use any Pokémon.
Bruno jumped down to find out why Onix was violent. Bruno avoided the hits thrown by Onix. After a while, Bruno found the reason why Onix was on a rampage: aSandslash had been stuck between two of its boulders, which was hurting it. After Bruno removed the Sandslash, Onix became very thankful for him and accepted to join histeam, so Bruno threw aPoké Ball at Onix and captured it. It hasn't been seen since.
Personality and characteristics
Onix was usually a friendly Pokémon but because of aSandslash being stuck inside it, it caused Onix to wither in pain, going on a rampage. Throughout the episode Onix appeared in, it had very little trouble dealing with Team Rocket's bazooka and Pokémon with the type-advantage.
InCan You Diglett?, Bruno used his Onix to battleRed during theirbattle onMt. Moon. Despite a type disadvantage againstGyara, it was able to hold its own and deftly avoid supereffective hits from itsWater-type attacks. Afterwards, it used itsBind to keep the Atrocious Pokémon from attacking at all, only to take damage from the latter'sBite. It then dug underground to launch a surprise attack, and this time faced off againstSaur. However, before that fight could conclude, it was interrupted by a pack ofDiglett crossing, and later Bruno'sElite Four comradesLorelei andAgatha.
InMake Way for Magikarp, Onix foughtBill andLt. Surge onCerise Island. He uses it this time to battle Red again. Onix was then used to carry Red and the others off of Cerise Island as it was collapsing.
