Well I say Lvl 60 swampert (earth quake,ice beam,hydro pump,surf)
Lvl 54 Machamp (Cross Chop,revenge,Bulk up, And 1 other move choice watever)
Lvl 55 Zangoose (Return,Sword Dance,Crush Claw,Toxic)
Lvl 52 Gardvior (Phschic,hypnosis,dream eater,Thunder bolt)
Lvl 49 Slaking (Facade,Focus Punch,areial ace,flamethrower)
Lvl 60 Camperupt(fireblast,earth quake,fissure,eruption)

I used a Sceptile with leaf blade-dynamic punch-quick attack-fury cutter
(you can get dynamic punch at mossdeep city)
salamence with dragon claw-fly-earthquack/rock slide-flamethrower
groudon with streangth-solar beam-fire blast-earthquack
swellow with areal ace-endeavor-quick attack-fly
walrain with ice beam-surf-body slam-ice ball
sorry I cant remember all of their moves but im pretty shur that I got most of them right hope I helped.

i cant beat them my pokemon are shelgon lv.37,swellow lv.38,groudon lv.59,swampert lv.67,solrock lv.39

i had
blazekin lvl 53
grouden lvl 48
shelgon lv 45
wailord lvl 41
keclen lvl 41
regiice lvl 41 and you can get regis before you beat the elite four.
and thats actually my team

Aggron level 55
blaziken level 57
salamence level 55
groudon level 53
flygon level 52
gyarados level 53

the pokemmon i used to beat the pokemon league where blaziken lvl 74 salemence 72 tyranitar 87 flygon 65 aggaron lvl 58 and groudon lvl 64 but im still tranin him

i used a fighting pokemon to beat the first and third guys, dark to beat the second, ice to beat the fourth, water and fire to beat the champion

rrealy sorry i reset the game i have swampert level 64 grouddon level 45
shelgon level 36
luvdisc level 35
swellow level 26
and solrock level 37

groudon-65 p.s. i now have a level 99 latios so thats all i need and i reccamend trading a latios or latias
blaziken-76

raichu-56
mawile-54

you should be able to take them, bu go to the mart in ever grande city and buy some full restores and revives, and you'll do just fine

day late and a dollar short. good team but 2 aggrons are ok you may want to switch out one for a physic type to round off your team. for me i like gravidor. mine at level 60 good stuff. my whole set is level 62 swampert, level 60 gravidor, level 55 gyrodos, 55 kyogre, and a level 76 blazikin, and 57 salamance.

i now have a
sceptile level 63
aggron level 50
aggron level 44
salamance level 54
walrein level 50
and a groudon level 51 ps.i am the person that asked the question

PLEASE ANWSER THIS QUESTION