Easy leveling up

If you want to lvl up your pkmn without rare candy wait for morning and send them after creepers, your pokemon will hit him once before the creeper change target to him, so then move it back into his pokeball so the creeper will just blows up without killing your dear pkmn. Each blow your pkmn deal give him a lvl or 2. If you're lucky you may be able to damage the creeper more than once before he blows up. Have Fun! :P