>>38974502A: Simple, would work as a first stage. Maybe it's evolution would have it get bigger and bloom big pretty flowers that hide a shit ton of thorns/just attracts pokemon so it can explode?
B. Not bad. Dunno if I like the baby-Zapdos thing by itself, but maybe it's species' whole gimmick can be that they copy other bird pokemon/just whatever's around them in general as a sort of camouflage? Like if they stick around a bunch of Xatu they start lookin like weird skinny Xatu/Natu, letting themselves integrate into nests and get free food/shelter. Just as an example.
C. 10/10, adorable, would use even if it's a shitmon. Definitely my favorite.
D. Not bad. Nice concept, could work well.
Overall probably... C>D>B>A, if I had to say?
Pic related is some fakemon someone did on top, and then edits an anon did on the bottom. I think they're adorable.