Tips on beating heartgold elite four?

First off, your entire team needs to level up at least to 50. This is the level of Lances dragonite and the rest of his team is just about there. Next, either evolve graveler to golem or trade it out for a fighting type. the fourth memeber uses dark types, and without a strong fighting type, she is extremely aggrivating. rock types are only really useful against lances charizard, but thats pretty much it. Also, teach lapras surf instead of brine, and teach raikou thunderbolt for spark. be sure to have as many hyper potions, elixirs, and ethers as you possibly can. elixirs and ethers can only be found, not bought.