Cloyster

#91 in the National Pokédex • Bivalve Pokémon

Normal

Shiny

Pokédex entries

Pokémon Emerald

It swims in the sea by swallowing water, then jetting it out toward the rear. The CLOYSTER 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 (elapsed hatch time varies; Flame Body or Magma Armor speeds hatching in Emerald)

Evolution

Evolution requirements shown in a compact table or chain view.

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

Held Items

Programmed base rates, before Compound Eyes. A held-item table does not establish a native wild encounter for this species.

Big Pearl

5% chance

Pearl

50% chance

Moves

Moves this Pokémon learns naturally by reaching specific levels.

		Class				Description
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	Withdraw	Status	-	-	40	Withdraws the body into its hard shell to raise DEFENSE.
Start	Protect	Status	-	-	10	Evades attack, but may fail if used in succession.
33	Spikes	Status	-	-	20	Sets spikes that hurt a foe switching in.
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 Emerald.

			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	Type varies	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.

Tutors

Moves this Pokémon can learn from move tutors in this game.

	Class				Description
Double-Edge	Physical	120	100	15	A life-risking tackle that also hurts the user.
Endure	Status	-	-	10	Endures any attack for 1 turn, leaving at least 1HP.
Explosion	Physical	250	100	5	Inflicts severe damage but makes the user faint.
Icy Wind	Special	55	95	15	A chilling attack that lowers the foe’s SPEED.
Mimic	Status	-	-	10	Copies a move used by the foe during one battle.
Sleep Talk	Status	-	-	10	Uses an available move randomly while asleep.
Snore	Physical	40	100	15	A loud attack that can be used only while asleep.
Substitute	Status	-	-	10	Creates a decoy using 1/4 of the user’s maximum HP.
Swagger	Status	-	90	15	Confuses the foe, but also sharply raises ATTACK.
Swift	Physical	60	-	20	Sprays star-shaped rays that never miss.

Traits

Ability options available to this Pokémon in this game.

Shell Armor

Blocks critical hits.

Protects against critical hits.

#90

Shellder

#92

Gastly

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