Pokémon Ruby Tips

Stop Evolution
Personally, I like it when my Pokemon evolve but maybe you don't that doesn't help you much does it. Well if you don't want it to evolve:
When It's trying to evolve (going back and fvorth betweeen the 2 shapes) just press the B button and the pokemon becomes startled and doesn't evolve. You may have to do this again a few times when your pokemon gets to the next level.