Unown [X]

It is believed that the variety of types of this Pokémon were created by evolutionary adaptation, as each possesses a different ability.

Pokemon Power — [XXXXX]: Whenever 1 of your Pokémon with Unown in its name uses its Hidden Power attack, flip a coin until you get tails. That attack does 10 more damage for each heads. If you have more than 1 Unown X in play, use only 1 [XXXXX] per turn.

Hidden Power (10)