A Stage 1 Pokemon Card of type Water with the title Misty's Cloyster and 70 HP of rarity Rare evolved from Misty's Shellder from the set Gym Heroes.  It has the attack Triple Cannon with the cost Water, Water, Colorless, the energy cost 3 and the damage of 20 with the description: Flip 3 coins. This attack does 20 damage times the number of heads. It has the ability Shell Armor with the description: You may reduce all damage done by attacks to Misty's Cloyster by 10 (after applying Weakness and Resistance). (Any other effects of attacks still happen). This power can't be used if Misty's Cloyster is Asleep, Confused, or Paralyzed. It has weakness against Lightning 2. 
Misty's Cloyster