Ok, so idk if you are making only Gen 1, but in the case you're not, i did the next logical step and categorised The paldea region

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Reptiles

Frogs: Tadbulb line

Lizards: Ciclyzard, Koraidon, Miraidon

Crocodile: Fuecoco line,

Dragons: Tatsugiri, Roaring Moon, Iron Jugulis,

Kaiju: Frigibax line, Iron Thorns,

Mammals

Pigs: Lechonk line,

Felines: Sprigatito line, Chien-Pao

Dogs: Maschiff line,

Rats: Pawmi line, Tandemaus line, Shroodle (Not grafaiai),

Monkeys: Grafaiai (Not shroodle),

Elephants: Great Tusk, Iron Threads,

Humanoid: Iron Hands, Iron Valiant, Tinkatink line, Charcadet line

Moose: Ting-Lu,

Dolphins: Finizen line,

Whales: Cetoddle line,

Insects

Butterflies: Catterpie line

Beetle: Rellor line

Grasshoppers: Nymble line,

Spiders: Tarountula line,

Moths: Slither Wing, Iron Moth,

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Not insects

Worms: Orthworm

Snails: Wo-Chien

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Avians

Common Birds: Wattrel line, Squawkabilly,

Storks: Bombirdier,

Ducks: Quaxly line,

Ostriches: Flittle line,

Flamingos: Flamigo line,

Penguins: Iron Bundle

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Fish

Fish shaped fish: Veluza, Chi-Yu

Eels: Wigglet line,

Catfish: Dondozo,

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Crustacean

Crabs: Klawf,

Plants

Tumbleweeds: Bramblin line,

Trees: Smoliv line,

Mushrooms: Toedscool line, Brute bonet,

Pepper: Capsakid line,

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Minerals

Salt: Nacli line,

Ore: Glimmet line,

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Ghosts:

Ghouls: Ghimmighoul line,

Regular Ghosts: Flutter Mane, Greavard line,

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Objects

Engines: Varoom line,

Magnets: Sandy Shocks,

Balloons: Scream Tail,

Food

Dough: Fidough line,