Cloyster

#91 in the National Pokédex • Bivalve Pokémon

This species is outside the Hoenn Pokédex. Obtaining it in Ruby or Sapphire requires a compatible Generation III trade or historical event.

Normal

Shiny

Shellder Gastly

Pokédex entries

Ruby

CLOYSTER is capable of swimming in the sea. It does so by swallowing water, then jetting it out toward the rear. This Pokémon shoots spikes from its shell using the same system.

Sapphire

CLOYSTER is capable of swimming in the sea. It does so by swallowing water, then jetting it out toward the rear. This Pokémon shoots spikes from its shell using the same system.

Details

Types

Weak to

2×

2×

2×

2×

Resists

0.25×

0.5×

Growth

EV yield, catch rate, and experience details for this Pokémon.

EV yield	2 Def
Catch rate	60
Base Exp.	203

Eggs

Egg groups, gender ratio, and hatching details for this Pokémon.

Egg groups	Water 3
Gender	50% male 50% female
Egg cycles	20 (256 steps per cycle; elapsed hatch time varies)

Evolution

Evolution requirements shown in a compact table or chain view.

Pokémon	Requires	Evolution
Shellder #90	Use Water Stone	Cloyster #91

Held Items

Items this Pokémon may hold when encountered in the wild.

These are the game’s programmed wild held-item rates. They do not establish a wild encounter location.

Big Pearl

Ruby

Sapphire

Pearl

Ruby

50%

Sapphire

50%

Moves

Moves this Pokémon learns naturally by reaching specific levels.

		Class				Description
Start	Withdraw	Status	-	-	40	Withdraws the body into its hard shell to raise DEFENSE.
Start	Supersonic	Status	-	55	20	Emits bizarre sound waves that may confuse the foe.
Start	Aurora Beam	Special	65	100	20	Fires a rainbow-colored beam that may lower ATTACK.
Start	Protect	Status	-	-	10	Evades attack, but may fail if used in succession.
33	Spikes	Status	-	-	20	Sets spikes that hurt a foe switching out.
41	Spike Cannon	Physical	20	100	15	Launches sharp spikes that strike 2 to 5 times.

Machines

Moves this Pokémon can learn from Technical Machines and Hidden Machines in Pokémon Ruby and Sapphire.

			Class				Description
TM03	Water Pulse		Special	60	100	20	Attacks with ultrasonic waves. May confuse the foe
TM06	Toxic		Status	-	85	10	Poisons the foe with an intensifying toxin.
TM07	Hail		Status	-	-	10	Summons a hailstorm that strikes every turn.
TM10	Hidden Power	Varies by IVs	Varies By Type	30–70	100	15	The effectiveness varies with the user.
TM13	Ice Beam		Special	95	100	10	Blasts the foe with an icy beam that may freeze it.
TM14	Blizzard		Special	120	70	5	Hits the foe with an icy storm that may freeze it.
TM15	Hyper Beam		Physical	150	90	5	Powerful, but leaves the user immobile the next turn.
TM17	Protect		Status	-	-	10	Evades attack, but may fail if used in succession.
TM18	Rain Dance		Status	-	-	5	Boosts the power of WATER-type moves for 5 turns.
TM21	Frustration		Physical	-	100	20	An attack that is stronger if the TRAINER is disliked.
TM27	Return		Physical	-	100	20	An attack that increases in power with friendship.
TM32	Double Team		Status	-	-	15	Creates illusory copies to raise evasiveness.
TM41	Torment		Status	-	100	15	Torments the foe and stops successive use of a move.
TM42	Facade		Physical	70	100	20	Boosts ATTACK when burned, paralyzed, or poisoned.
TM43	Secret Power		Physical	70	100	20	An attack with effects that vary by location.
TM44	Rest		Status	-	-	10	The user sleeps for 2 turns, restoring HP and status.
TM45	Attract		Status	-	100	15	Makes the opposite gender less likely to attack.
HM03	Surf		Special	95	100	15	Creates a huge wave, then crashes it down on the foe.
HM08	Dive		Special	60	100	10	Dives underwater the first turn and strikes next turn.