Regardless of how different the shapes of the eyes are, they all share the same and very close style of chibi. They all look very similar with round eyes and not much change between them.

Er, no pay more attention to the indivual sprites next time before you make a stereotypical assumption by looking at the first 3

They all have the same kind of eyes... =.=

 I have no idea what most of them are supposed to be, but they're still very close to the Pokemon style. Good job!

Also, i absolutely love the narwhale in the bottom left.

A lot of them can easily be real pokémons, awesome piece!

and that bomb spider is cool! :D

lol! evolution before Croagunk! :D
love the evolution before crfoagunk and the second one from the left upper corner! awsome! :D