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Please don't make them too op.
New move:
Poisonous Drain (Poison duh) (60 BP)
The equivalent of Drain Punch but if the target is poisoned, inflicts double damage and cures the poisoning.
New ability:
Roll up/Shell guard
(depends on the Pokémon, it's like a Vital Spirit - Insomnia thing)
If the user HP is below its half, the user hides in his shell/rolls up and raises defense by three stages.
I think this will be a cool ability if it has some sprite change in Pokémon like Sandshrew, Dweble, Tirtouga or Scolipede if they actually roll up or hide in they shell when the ability is triggered.