Well, this drawing is sorta of amazing: so many pokemon here! I like it. In fact, i really love how you managed to characteryze them by making them pose differently. So, to sum up that's a good job.
By the other hand, i only have some bad things to say (i am sorry, if not, that would be too kind, and i am here to be a mercyless critiquer. Haha, don't worry, honestly i don't see many bad points, it's simply that i am forced to look for them!): the background: is not too original but who cares? In fact, is a matter of the main characters posing there, not the background!
Another bad point? Well, i see that you are awesome in lucario drawing, but you seem to have little difficulties in the drawing of other creatures. Don't mind, cos it's a matter of practice. Personally, i am a lame on drawing human, lucarios or riolus, but good at reptiles. So, as I said, is a matter of practice!
Now, more good points!
Well, appart from the characterization, the whole idea is pretty awesome: so i must say that all your comrades will love it.
So, congratullations!