It exists in several finishes (Normal, 1st edition). Each one has its own price; the average above is for the regular version.
Artwork by Ken Sugimori. Some collectors chase every card by the same artist: how to start (in Spanish).
Abilities
Shell Armor Pokemon Power
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.
Attacks
WaterWaterColorless
Triple Cannon
20x
Flip 3 coins. This attack does 20 damage times the number of heads.