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Hear me out. Fish type.
>Weak to Flying (because birds eat fish), Dragon (because dragons eat fish), and Poison (because poison kills fish)
>Resists Psychic (because fish are stupid), Fighting (because fish are slippery), and Ground (because fish live underwater)
>Super effective against Water (because fish breathe water), Bug (because fish eat bugs), and Psychic (because getting slapped with a wet trout is an ancient IRC meme for someone being stupid in chat)
>Not very effective against Rock (because fish can't hurt rocks), Fire (because you can put fish on a grill), and Ice (because fish are cold-blooded)
Fish Pokémon:
>Goldeen: mono-Fish
>Seaking: Fish/Water
>Horsea: Water/Fish
>Seadra: Water/Fish
>Magikarp: mono-Fish
>Qwilfish: Fish/Poison
>Chinchou: Fish/Electric
>Remoraid: mono-Fish
>Mantine: Fish/Flying
>Barboach: Fish/Ground
>Whiscash: Fish/Ground
>Carvanha: Fish/Dark
>Sharpedo: Fish/Dark
>Feebas: mono-Fish
>Huntail: mono-Fish
>Gorebyss: mono-Fish
>Relicanth: Fish/Rock
>Luvdisc: mono-Fish
>Finneon: mono-Fish
>Lumineon: mono-Fish
>Basculin: mono-Fish
>Tynamo: Fish/Electric
>Eelektrik: Fish/Electric
>Eelektross: Fish/Electric
>Alomomola: Water/Fish
>Skrelp: Poison/Fish
>Bruxish: Fish/Psychic
>Wishiwashi (Solo): mono-Fish
>Wishiwashi (Schooling): Water/Fish
>Arrokuda: mono-Fish
>Barraskewda: mono-Fish
>Dracovish: Fish/Dragon
>Fisheon (new Eeveelution: it's a fish)
Retyped Fish-type moves:
>Splash
>Aqua Tail
>Fishious Rend
They would also get a few new moves, but I don't have any ideas for that.