As long as you have more Prize cards left than your opponent, Vespiquen's attacks do 10 more damage for each Grass Pokémon on your Bench to the Active Pokémon (before applying Weakness and Resistance).

Bee Drain

20

After your attack, remove from Vespiquen the number of damage counters equal to the damage you did to the Defending Pokémon.

Bee Powder

50

Flip 2 coins. If both are heads, the Defending Pokémon is now Burned, Paralyzed, and Poisoned.