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I'm kind of a shit sketcher so bear with me, the illustration is just an idea.
Mega-Primeape
HP: 65 -> 65
Attack: 105 -> 135 (+30)
Defense: 60 -> 90 (+30)
Sp.Atk: 60 -> 60
Sp.Def: 70 -> 95 (+25)
Speed: 95 -> 115 (+15)
Ability: Berserker
>Tantrum moves (Thrash, Outrage, and Petal Dance) always last for the maximum amount of turns. (For the record, Primeape learns Thrash by level-up and Outrage by tutor in ORAS)