Just so I don't clutter the AG thread I will answer your question here. The reason earth power is bad is cause then Thundurus proves to be a problem. When sleeping you will only be able to hit it 1/3 of the time allowing it to get a substitute in more easily. HP fire can break the Sub. The only good thing with earth power is hurting M Gengar, but I personally think HP fire will be more useful more often.