Where to catch, #0044
Gloom in Red and Blue: 4 places, levels 28 to 30
4 encounters by area
Places
Route 12, Route 13, Route 14 and 1 more
Other games
Also found in 14 other games
Red and Green (Japan)YellowGold and SilverCrystalRuby and SapphireEmeraldFireRed and LeafGreenDiamond and PearlPlatinumHeartGold and SoulSilverX and YLet's Go, Pikachu and EeveeSword and ShieldThe Crown Tundra