I am not sure if this already exists or not, but if not it'd be cool if there was a real good reward for completing and collecting all the pokemon. Give people another reason to catch all they can
Ya that would be cool, but instead of collecting all the Pokemon, why not getting all the pokemons in pokedex as "seen." Cause I'm pretty sure few people would be able to catch all the Pokemon because that would mean that you need all of the legendaries.