>>18224745For a signature ability, I thought of three.
Venom Jaw: Biting moves have a 30% chance of badly poisoning the opposing pokemon.
Stalker: Prevents opposing poisoned pokemon from fleeing.
Opportunist: Gives priority to attacking moves when the opposing pokemon is at 15% or lower health.
I see a pokemon that focuses on wearing the opponent down with poison, then finishes them off with a quick strike.