Venom the Poisoned Applin

Venom is a Grass and Dragon Applin with a rather unique set of traits. When he burrows into an apple (or any other fruit for that matter) a poison seeps deep into it, preserving the fruit while also altering the appearance. All fruits gain the poison apple slime along the top of them and a marking that looks like fangs.

Eating the fruit after Venom has taken up in it will poison the creature eating it (excluding poison type and steel type pokémon).
This makes the moves Grav Apple and Apple Acid double as a poison type attack with the chance of poisoning the target. (Those immune to the poison effects treat it as a purely grass type attack. Those immune to the grass attack are not affected by the poison side effects)

Yes, I know Applin doesn't learn Grav Apple or Apple Acid, but shhhh.