Icant beat e4 with lvl70torrterralvl53 dialgalvl53mespritlvl51starapt… plz help!!!!!!!

get a full team of six. get strong fire type, a super strong water type, a strong psychic type, and make a balanced team of lvls close to 70. i beat the e4 in ONE try.when i challenge them again with a weak pokemon with exp. share, i never lose.