Key, i dont think theres a very big possibility of cyndy comin back, he wants to start fresh. Hopefully, he wont do like in Kanto and just get enough pokes to get by, but do like he did in Johto and Kanto, and catch a bunch.
Anyways, i'm pretty sure brock is going to get Chimchar, but if not, then ash'll get him. If not Chimchar, then i dunno. In the anime, they never show or go into very much detail about the trading evos, so i'm pretty sure he wont get a magby to evolve into a magmar then to the next evo to have a 4th gen poke, which is part of the reason he went to sinnoh. So there are three possibilities left, he catches a 1, 2, or 3 gen fire poke, or he goes without a fire poke, OR he takes a fire poke from the poke coral, which i totally doubt, so i dunno
@ Neo shadow: I just checked bulbapedia, it says nothing but that Paul has a Chimchar and where it was first seen.
so: NO ONE KNOWS YET WHO IS GETTING THE CHIMCHAR, SO STOP SAYING WHO DOES AND WHO DOESN'T HAVE THE CHIMCHAR, NO ONE KNOWS YET!!!!!!!!