I know some of them are stem mammals

Also Prehistoric Rodents are allowed

Deltatheridium is winning so far

@Savage Almond

@Dinosaur Zone

@TheBrandOfTheExalt

@Parkersaurus

@Kelbeam

@Nizaluddin

Idk, maybe megazostrodon

Can’t wait for Megazostrodon being a regional variant of Rattata or even Pichu

Deltatheridium Rodent and Megazostrodon Pokachu Clone

I only know Megazostrodon

Deltatheredium is a badass

Josephoartigasia AKA the largest rodent that ever lived

Maybe it should be Pikachu's extinct grandpa.