Every Poison attack should poison the opponent as well as causing damage (unless immune).

To compensate, some of the high power poison attacks should have their power reduced, they should all be low or at most medium power attacks.

And only Posion type mons can learn any Poison type attack. But not every Poison move, just the attacks (so Vaporeon can still learn Acid Armor).

Also Toxic should be retired as there's no need for it if every Poison attack does the same thing + direct damage.