I'll start.
Demojira
The Absolute Pokémon
Typing: Dragon/Poison
Ability: Relentless(This Pokémon boosts a random stat by two stages each time it knocks out a Pokémon)
HP: 155
Atk: 110
Def: 125
SpA: 125
SpD: 125
Speed: 40
BST: 680
He'd basically be a box legend, his signature move would be.
>Atomic Breath
Power: 140
Accuracy: 100
PP: 10
Raises Special Attack on the first turn, attacks on the second