I reached Lance completely deathless with my team of Feraligatr, Crobat, Ampharos, Scizor, Mamoswine, and Houndoom, all at Lvl. 61. Thought I was gonna have the champion in the bag... then out came a Lvl. 72 Salamence. Knew it was over immediately
My team literally had: Ho-oh : lvl 73 - Typhlosion: lvl 57 - Dragonite: lvl 56 - Mewtwo: lvl 73 - Ampharos: lvl 51 - Tyranitar: lvl 58. I dont know how i even did it with a underlevel team (expect ho-oh and mewtwo) but it took like 25 tries.
Guys, I've just destroyed lance's team with my Lugia level 72... with only Lugia.... it was thanks to the ancient power that increased his stats, and Lugia just destroyed that Garchomp and the Dragonite. Lugia is just too broken. If you have pokemon heartgold, I really recommend you to catch Lugia before rematch the Elite four. Lugia is INCREDIBLY STRONG