Okay, how much of a pokemon fan am i to not recognize only two of those characters...?
Anyways!
I'm going to number them by appearance from left to right. Since names escape me as well. Except for zangoose and delibird. Zangoose's pose is perfect. Excellent normal type as well. Weevil's pose should be the extreme opposite of pokemon number 12. Right now he's not dynamic enough like the others have said.
When I make that pose, my head is a little farther down. My body is stretched back a little more, expecting attacks from below. The arm that is straight out, is just a little bit lower and bent a little too. Plus, I think it would help if you swap the leg poses. The forward leg should be forward for balance, the back leg bent for steadiness.
I have no clue what pokemon are numbers 2, 11, 12, 15, and 16 are. Not a clue.
(psst, yes, i have heartgold, and we get the phanphy this time, oh yes, we get the cute little phanphy.

)