Yeah, as others said already, these are pretty cool - it seems like you have put LOTS of effort towards them development, which is great. Nintendo should have TOTALLY used those Giratina/Palkia sprites of yours in Platinum. :P
EDIT: Dang, I really haven't noticed that this topic had THREE pages! XD Uh, well... *checks the newest artworks* ...oh god. Those fake gym leaders you made are completely awesome. I am DYING to make my own fake gym leaders' sprites in D/P style, and every single attempt of mine turns out horrible. On the other hand, your gym leaders look professional. 'Nuff said. Oh, and your fake Pokemon look pretty fascinating, too - I especially like those fire-type ones.