Captain Jigglypuff
Leader of Jigglypuff Army
How about a cone shell Water/Poison Pokemon And something based on the Triton’s trumpet that is said to be Toxapex’s natural predator to fill the sea snail slot? The Triton’s trumpet Pokémon could be stated to be wild Corsola’s best friend and where that particular sea snail is common, Corsola form colonies around them. This Pokémon could even have Immunity as one of its Abilities to show how Toxapex’s poison won’t affect the sea snail.