Shroomish

Effect Spore : Whenever a move makes contact with this Pokémon, the move's user has a 30% chance of being paralyzed, poisoned, or put to sleep, chosen at random. Nothing is done to compensate if the move's user is immune to one of these ailments; there is simply a lower chance that the move's user will be affected.

Poison Heal : If this Pokémon is poisoned, it will heal for 1/8 of its maximum HP after each turn rather than taking damage. This includes bad poison.

Quick Feet : Whenever this Pokémon has a major status ailment, it has 1.5× its Speed. This Pokémon is not affected by the usual Speed cut from paralysis. Overworld: If the lead Pokémon has this ability, the wild encounter rate is halved.