REPTILES OFF THE TOP OF MY HEAD: horned toad, thorny devil, jesus lizard, marine iguana, spider tailed snake, flying snake, worm snake, dracorex, legless lizard, soft shelled turtle, armadillo lizard, gila monster, phrynocephalus, mexican mole lizard, shingleback skink, proboscis anole
AMPHIBIANS OFF THE TOP OF MY HEAD: flying frog, pac man frog, surinam toad, mole frog or turtle frog, hairy toad, spined newt, blind cave salamander, caecilian, greater siren
BIRDS: potoo, cassowary, kakapo, kiwi, shoebill, any of the birds of paradise from brazil, heron, puffin........actually wait fuck birds there's like 1,000 distinct pokemonable birds
MAMMALS: opossum, porcupine, moose, star nosed mole, those tiny little long-tailed anteaters that live in trees, babirusa, naked mole ra.....actually you know what fuck mammals too I'll be here all day.
BUGS: oh my god like a thousand more. Jesus. How about just my top 20? Vinegaroon, velvet worm, tardigrade, blowfly, sea spider, flea, robber fly, weevil, grasshopper, dust mite, camel spider, whip spider, earwig, termite, water boatman, mayfly, aphid, treehopper, head louse, mantis shrimp
FISH: viperfish, barreleye, goblin shark, whale shark, carpet shark, cookie cutter shark, sawfish, swordfish, clown fish, box fish, knifefish, pleco, alligator gar, tripod fish, flying fish, stonefish, lionfish, garden eel, jesus this is almost worse than the birds or bugs
OTHER INVERTEBRATES: uh...god...shit....I can think of 30 annelid worms alone that would make super colorful unique pokemon almost unaltered. Don't even get me started on gastropods. Ribbon worms. Anemones. Siphonophora.
I could probably fill ten more generations and not run out of suggestions, OP. They are set for life if they just stray a little farther outside the same memeable animals every generation.
