xD Man, that brings back memories. We(me, my brother and some friends) once held a 'tournament' of sorts. Everyone chose 3 pokemon to use, then 'battled' each other, pretending to be the pokemon ourselves. Was pretty fun, especially since we had some rules about who'd win in what cases.
http://jojodee.deviantart.com/ -- Fakemons and other stuff
I was 11-12 when Pokemon came out, so I was a little old for playing pretend. I spent my time drawing and writing about Pokemon. I did still manage to get a little pretending squeezed in though. I remember throwing plastic Pokeballs at my neighbors chickens, Digging holes everywhere looking for evolution stones and such.
I distinctly remember being at the community pool one day with some friends and saying "this is my impersonation of charmander" at which point I jumped in the pool and floated to the surface facedown.