Where to Find Clamperl

Generation 1

Red
Blue
Yellow

Generation 2

Gold
Silver
Crystal

Generation 3

Ruby

Underwater (Routes 124 and 126)

Sapphire

Underwater (Routes 124 and 126)

Emerald

Underwater (Routes 124 and 126)

Fire Red
Leaf Green

Generation 4

Diamond

Routes 219 and 221 (Super Rod)

Pearl

Routes 219 and 221 (Super Rod)

Platinum
Heart Gold

Route 19 (Surfing during a Swarm)

Soul Silver

Route 19 (Surfing during a Swarm)

Generation 5

Black

Route 4 (Fishing)

White

Route 4 (Fishing)

Black 2

Route 4 (Fishing)

White 2

Route 4 (Fishing)

Generation 6

X

Route 12 (Good Rod)

Y

Route 12 (Good Rod)

Omega Ruby

Routes 107, 124, 126, 128, 129, 130 (Underwater)

Alpha Sapphire

Routes 107, 124, 126, 128, 129, 130 (Underwater)

Generation 7

Sun
Moon
Ultra Sun

Route 15, Melemele Sea (Fishing)

Ultra Moon

Route 15, Melemele Sea (Fishing)

Let's Go Pikachu
Let's Go Eevee

Generation 8

Sword
Shield
Brilliant Diamond

Routes 219 and 221 (Super Rod)

Grand Underground – Fountainspring Cave, Riverbank Cave, Still-Water Cavern (After obtaining the National Pokédex)

Shining Pearl

Routes 219 and 221 (Super Rod)

Grand Underground – Fountainspring Cave, Riverbank Cave, Still-Water Cavern (After obtaining the National Pokédex)

Legends Arceus

Generation 9

Scarlet
Violet

Clamperl Evolution Tree

Trade while holding Deep Sea Tooth

Trade while holding Deep Sea Scale