Where to catch, #0116
Horsea in Let's Go, Pikachu and Eevee: 3 places, levels 13 to 38
3 encounters by area
Places
Route 11, Route 12 and Route 13
Other games
Also found in 18 other games
Red and Green (Japan)Blue (Japan)Red and BlueYellowGold and SilverCrystalRuby and SapphireEmeraldFireRed and LeafGreenDiamond and PearlPlatinumHeartGold and SoulSilverBlack and WhiteBlack 2 and White 2X and YSun and MoonUltra Sun and Ultra MoonThe Isle of Armor