Platinum caught Lopunny sometime prior toStriking Out Snover, and was her first capture after starting her journey toMount Coronet. She was first seen inTo and Fro with Froslass, participating in Platinum'sGym battle againstCandice and herAbomasnow. Lopunny initially struggled due to Platinum's hesitancy since they had never battled before, but she soon shook it off and used Lopunny's agility and dance-like movements to defeat Abomasnow. Lopunny then went up againstFroslass and was immediately pinned down to prevent her from using the same strategy and was defeated. Before being defeated though, Platinum had Lopunny useHealing Wish in order to bringRapidash back to full health, allowing Platinum to win the battle.
InShorting Out Electivire, Lopunny was Platinum's first choice in her battle againstVolkner and called out againstElekid. Lopunny fired a barrage ofFocus Blasts but ended up missing and getting hit byFocus Punch. Although Volkner thought the battle was over, Lopunny used her speed to sneak up behind Elekid and useDizzy Punch, giving Platinum the first win.
InGetting the Drop on Gallade II, Lopunny participated in Platinum'sBattle Castle challenge. Lopunny is picked as her last resort againstDarach due toEmpoleon and Rapidash being close to defeat. She first went up against hisHoundoom and almost took it out with one hit, but Houndoom endured thanks to itsFocus Sash. Houndoom then countered withFire Fang, but Platinum switched into Empoleon before the attack could hit. Lopunny was later sent out to battle against Darach'sGallade. Due to the type disadvantage and the damage taken from the battle before, Lopunny was easily outmaneuvered and took a direct hit fromNight Slash. Barely standing, Lopunny managed to crawl over to Gallade and land a weak Dizzy Punch before fainting. Darach laughed at her weakness, but soon found out that Gallade was inflicted with Lopunny'sCute CharmAbility and confused by Dizzy Punch. This allowed Empoleon to easily defeat him, giving Platinum the win.
InExit Empoleon, Lopunny fought in Platinum'sBattle Arcade challenge. During the battle againstDahlia, Platinum and Dahlia had to switch Pokémon due to the roulette, meaning Lopunny and Platinum's other Pokémon were forced to fight against their Trainer. Although both sides were reluctant at first, both Platinum and her Pokémon manage to fight at their full strength, which eventually ended with Platinum as the victor.
When Platinum went to challenge theBattle Factory inSoftening Up Kakuna, she sent Lopunny and her other Pokémon to search forLooker onStark Mountain, who had gone missing. They soon return, heavily injured and exhausted with a similarly injured Looker andBuck.
Lopunny is a powerful and agile battler, being able to dance around her opponents with ease. Despite being powerful, Platinum often uses her to help the rest of her team fight, by either inflicting status conditions to opponents orhealing her teammates. Lopunny has a strong connection with herTrainer and was the most reluctant of her Pokémon to fight her during theBattle Arcade match.
