cadcrafter posted... This question always leaves out the most important part: the battlefield!!
Basically, if the pokemon have access to enough space to run and/or fly away from the dinos AND the dinos have no access to food or water, then the pokemon win by having some of the levitating mons who dont need food (or at least food in the traditional sense) get away as the dinos all starve to death and slowly die off after canabalizing themselves. Otherwise either the mons wont have enough space to stall out the massive wave of a billion dinos before they all starve or the requirment that the small army of pokemon alone would have to genocide the whole species in a healthy ecosystem would make it a nearly impossible task that would require some serious breeding on the pokemon side with some healthy doses of habitat and enviormetal destruction.
if were talking literally 1 billion dinosaurs then the battlefield could only be the entire planet