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Abilities, attacks, weakness & resistance
Any damage done to Cloyster by attacks is reduced by 20 (after applying Weakness and Resistance).
Flip 2 coins. This attack does 10 damage times the number of heads. If either of the coins is heads, the Defending Pokémon is now Paralyzed.
Other cards from FireRed & LeafGreen
Zapdos ex (Holofoil)
Moltres ex (Holofoil)
Articuno ex (Holofoil)
Charmander (Holofoil)
Venusaur ex (Holofoil)
Mr. Mime ex (Holofoil)
Mr. Mime ex (Holofoil)
Gyarados ex (Holofoil)
Gengar ex (Holofoil)
Electrode ex (Holofoil)
Clefable ex (Holofoil)
Charizard ex (Holofoil)
Cloyster (ex6-20 Reverse Holofoil) is a Stage 1 Water Pokémon from the FireRed & LeafGreen set. Its Poké-Body Exoskeleton reduces damage taken from attacks by 20 after Weakness and Resistance. It has two attacks: Double Bubble, which flips two coins to deal up to 20 damage and can Paralyze, and Shell Attack which deals 50 damage for three energy.
Catalog pricing data as of 21 Apr 2026, 02:24
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