If this is Emerald get Raquaza and Kyogre and also get Groudon then you beat the elite four with those three plus the Sceptil.
you have to beat the last lvl in the trick house (to unlock the 8th lvl you need defeat the elite 4)
Train your Pokemon better, or use an action replay,man.
I beat it with staraptor lvl.58 uxie lvl.53 palkia lvl.57 torterra lvl.48 geodude lvl.8 and quagsire lvl.20 with revives and hyper potions
I beat it with Staraptor lvl.57 uxie lvl.53 and palkia lvl. 56with torterra lvl.47 geodudelvl.8 and another weak pokemon(i forgot which one.
how to beat Pokemon emerald
Well it doesn't mater what pokemon u havebut what level they have pokemon at lvl 70 or more have a greater chance because the elite four have pokemon from lvl 40 to lvl 60.
you have to get all 8 badges beat the elite four and a good team example level 40 and up i beat them the with rampardos lvl 41 infernape lvl 56 ambipom lvl 39 magmortar lvl 49 and a lvl 70 crobat
no i could not beat him with lvl 69s but i beat him with a lvl 81
raise all there lvls about 10 lvls and the pupitars raise 15 lvls UPDATE: Actually, you can beat the elite four with all level 60's. Ive tried. And succeded.
The Cerulean Cave? You have to beat the Elite Four and give the ruby and sapphire to Neal or whatever his name is on One Island. In the cave is lvl 70 Mewtwo! He's very powerful!
it depends what moves they have
Ok, strategically your best lineup would be: Blaziken lvl 40+ Groudon lvl 50+ Salamence Lvl 65-70 Flygon lvl 70+ Wailord lvl 40+ Milotic lvl 50+