My state is crazy diverse with huge lakes and surrounding forests, tons of swampland, and ponds, so this'll be fun!
General wild: Deerling and Sawsbuck, Deerling and Sawsbuck absolutely everywhere. Running out in front of automobiles becoming a normal hazard everybody needs to be cautious of, Buneary, Bunnelby, Scorbunny, Zubat, Zangoose, Persian, Ekans, Seviper, Diglett/Dugtrio, Drilbur, Geodude, Stunky/Skuntank, Salandit, Dedenne, Plusle/Minun, Pachirisu, Togedemaru. a metric ton of feral cats of all species,
Around lakes/ponds: Ducklett/Swanna, Turtwig/Grotle/Torterra, Surskit, Poliwag up to Politoed, Tympole/Palpitoad, Froakie, Tirtouga, Dewpider/Araquanid,
Aquatic (in lakes/ponds): Feebas, Relicanth, Magikarp, Finneon/Lumineon, so much Basculin, Clamperl (but the more sickly version, like mussels vs. actual clams and oysters), Shellder, Bruxish probably, Wimpod/Golisopod, Dhelmise in our lakes.
Forests: Shroomish/maybe Breloom, Foonguss/Amoonguss, Morelull/Shiinotic, Seedot, Sudowoodo, Teddirusa/Ursaring, Stufful/Bewear,
On farms: Miltank/Tauros, Tepig, Skiddo/Gogoat, Mudbray/Mudsdale, Ponyta/Rapidash
Birds: Pikipeck/Trumbeak (no Toucannon though), Taillow, Wingull, the rare Braviary, Murkrow/Honchcrow,
Bugs: So much Ledyba. Ledyba would infest houses here (ladybug infestations are horrible here), Combee/Vespiqueen, Beedrill, Kricketot/tune, Spinarak/Ariados, Dustox, Mothim, Yanma/mega, Durant, Venonat/moth,
Because we get ridiculous winters: Cubchoo/Beartic, Delibird, Cryogonal, Vanillite/Vanillish/Vanilluxe, Bergmite, Snover/Abomasnow in the forests