Magnemite (N2 #26)

During your next turn, treat any tails flipped when using Magnemite's Electric Bolt attack as if they were heads. (Benching or evolving either Pokémon ends this effect.)

Flip 2 coins. If both are heads, the Defending Pokémon is now Paralyzed. If either of them is tails, this attack does nothing (not even damage).