Single post in Pokeballs

Hey guys, My younger cousin came up with this idea but I realized it might be a little bit considerable so I figured I'd post. I'm sure people have suggested the use of pokeballs before but then realized that there's no actual catching in the game, but I thought that if you could put a Pokemon that you already owned into a pokeball then that pokeball would give the Pokemon certain bonuses depending on what basis it was in. For instance, a great ball would multiply the amount of xp a Pokemon receives by 1.5 or something like that. Just a thought.