I will not critisize the actual pixel part of this art, since too me, you are amazing at making pixel part, but I will critisize the anatomy of your pokemon.
This is really good. However, one thing is wrong here. The beak. You have the top beak the same size as the bottom beak. It should be a bit longer than the bottom peak, and it would be curving downwards slightly, just like the Sugimori artwork. If you fix that, then I think it would be perfect :)
Basically they only thing I see wrong here is the flame. It needs to be way bigger, and also needs to be less straight. Flames are crazy, especially Typhlosion's, so make it bigger and crazier. Oh, and the arms are a bit too skinny. Make him have more muscle ;P
This is just all over the place. The head is in a very weird position. I know you want to show that it is turning its head, but you are not protraying that too well, tbh. Sorry...also, the legs are very weird. You have one leg going one way, and the other going the other way. Also, the leg on the far right, why is it behind the outline of Chikorita? It shouldnt be, and should be apart of the body on the front. At least, that is the way I see it.
I hope I have helped ;D