Great Encounters set of Diamond & Pearl series

Butterfree
Stage 2
HP120
Evolves From: Metapod
Pokédex No.12
Parallel Drain
After your attack, remove from 1 of your Pokémon the number of damage counters equal to the damage you did to the Defending Pokémon.
Dozing Scales
Flip a coin. If heads, the Defending Pokémon is now Asleep. If tails, the Defending Pokémon is now Poisoned.