Dark Explorers set of Black & White series

Jolteon
Stage 1
HP90
Evolves From: Eevee
Pokédex No.135
Electrigun
You may discard a Lightning Energy attached to this Pokémon. If you do, this attack does 40 more damage.
Pin Missile
Flip 4 coins. This attack does 40 damage times the number of heads.