Edition differences: original GBA and Nintendo Switch (2026)

Battle data describes Generation III rules. Availability notes distinguish native catches, evolution and breeding from original GBA imports. GBA games can trade with compatible Generation III games after the network quest; Switch supports local FireRed/LeafGreen trading and cannot import Pokémon from other games. Transfers to Pokémon HOME are one way.

GBA: AuroraTicket and MysticTicket required historical event distributions. Switch: both tickets are added after entering the Hall of Fame, providing access to Deoxys on Birth Island and Lugia/Ho-Oh on Navel Rock. Other event Pokémon and GBA imports are not made available by these tickets.

Original GBA: a roaming Entei or Raikou that successfully ends an encounter with Roar disappears permanently because of a game bug. The Switch editions fix this Roar disappearance bug.

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Clamperl

#366 in the National Pokédex • Bivalve Pokémon

Normal

Shiny

Walrein Huntail

Pokédex entries

FireRed

It is protected by a sturdy shell. Once in a lifetime, it makes a magnificent pearl.

LeafGreen

It is protected by a sturdy shell. Once in a lifetime, it makes a magnificent pearl.

Details

Type

Weak to

2×

2×

Resists

0.5×

0.5×

0.5×

Growth

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

EV yield	1 Def
Catch rate	255
Base Exp.	142

Eggs

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

Egg groups	Water 1
Gender	50% male 50% female
Egg cycles	20 (5,375 steps)

Evolution

Evolution requirements shown in a compact table or chain view.

Pokémon	Requires	Evolution
Clamperl #366	Trade holding Deep Sea Tooth This line requires importing Pokémon from another Generation III game on GBA; unavailable on Switch. Requires the National Pokédex.	Huntail #367
Clamperl #366	Trade holding Deep Sea Scale This line requires importing Pokémon from another Generation III game on GBA; unavailable on Switch. Requires the National Pokédex.	Gorebyss #368

Held Items

Items this Pokémon may hold when encountered in the wild.

Blue Shard

FireRed

LeafGreen

Moves

Moves this Pokémon learns naturally by reaching specific levels.

		Class				Description
Start	Water Gun	Special	40	100	25	The foe is struck with a lot of water expelled forcibly from the mouth.
Start	Clamp	Special	35	75	10	The foe is clamped and squeezed by the user’s shell for two to five turns.
Start	Whirlpool	Special	15	70	15	The foe is trapped in a fast, vicious whirlpool for two to five turns.
Start	Iron Defense	Status	-	-	15	The user hardens its body’s surface to sharply raise its DEFENSE stat.

Machine compatibility for Generation III. HM08 Dive cannot be obtained in FireRed or LeafGreen; a Pokémon must learn it in another Generation III game and be traded in on GBA. Switch has no incoming transfers from those games.

		Class				Description
TM03	Water Pulse	Special	60	100	20	An attack with a pulsing blast of water. It may also confuse the foe.
TM06	Toxic	Status	-	85	10	A move that badly poisons the foe. Its poison damage worsens every turn.
TM07	Hail	Status	-	-	10	A hailstorm lasting five turns damages all Pokémon except the ICE-type.
TM10	Hidden Power	Physical	-	100	15	An attack that varies in type and intensity depending on the user.
TM13	Ice Beam	Special	95	100	10	The foe is struck with an icy beam. It may freeze the foe solid.
TM14	Blizzard	Special	120	70	5	The foe is blasted with a blizzard. It may freeze the foe solid.
TM17	Protect	Status	-	-	10	Enables the user to evade all attacks. It may fail if used in succession.
TM18	Rain Dance	Status	-	-	5	A heavy rain falls for five turns, powering up WATER-type moves.
TM21	Frustration	Physical	-	100	20	This attack move grows more powerful the less the user likes its TRAINER.
TM27	Return	Physical	-	100	20	This attack move grows more powerful the more the user likes its TRAINER.
TM32	Double Team	Status	-	-	15	The user creates illusory copies of itself to raise its evasiveness.
TM42	Facade	Physical	70	100	20	An attack that is boosted if user is burned, poisoned, or paralyzed.
TM43	Secret Power	Physical	70	100	20	An attack that may have an additional effect that varies with the terrain.
TM44	Rest	Status	-	-	10	The user sleeps for two turns to fully restore HP and heal any status problem.
TM45	Attract	Status	-	100	15	If it is the other gender, the foe is made infatuated and unlikely to attack.
HM03	Surf	Special	95	100	15	A big wave crashes down on the foe. Can also be used for crossing water.
HM07	Waterfall	Special	80	100	15	A powerful charge attack. It can also be used to climb a waterfall.
HM08	Dive	Special	60	100	10	The user dives underwater on the first turn and strikes next turn.

Tutors

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

	Class				Description
Body Slam	Physical	85	100	15	The user drops its full body on the foe. It may leave the foe paralyzed.
Double-Edge	Physical	120	100	15	A reckless, life-risking tackle that also hurts the user a little.
Mimic	Status	-	-	10	The user copies the move last used by the foe for the rest of the battle.
Substitute	Status	-	-	10	The user creates a decoy using one-quarter of its full HP.

Breeding

Moves this Pokémon can inherit through breeding or similar methods.

	Class				Description
Barrier	Status	-	-	30	The user creates a sturdy wall that sharply raises its DEFENSE stat.
Body Slam	Physical	85	100	15	The user drops its full body on the foe. It may leave the foe paralyzed.
Confuse Ray	Status	-	100	10	The foe is exposed to a sinister ray that triggers confusion.
Mud Sport	Status	-	-	15	Weakens ELECTRIC-type attacks while the user is in the battle.
Refresh	Status	-	-	20	A self-healing move that cures the user of a poisoning, burn, or paralysis.
Supersonic	Status	-	55	20	The user generates odd sound waves. It may confuse the foe.

Traits

Ability options available to this Pokémon in this game.

Shell Armor

Blocks critical hits.

Protects against critical hits.

#365

Walrein

#367

Huntail

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