>>12101650Reasons for the Nidoran line and the Marowak line being in reptiles are the banded bellies usually attributed to reptiles. Go on, name a mammal that has that kind of belly. I'll wait.
Anyway, the reasons for some of my unsorteds: Abra line has chitinous looking plates, which would make it similar to an arthropod, but it's humanoid so it might be a mammal. For Macho line, they resemble reptiles because of the skin, not to mention the fact that their females don't seem to have mammaries (The reason why Jynx was placed in mammals), but they MIGHT be mammals.