there isn't much you can do other that level up your pokemon. when i tryed to beat them at first i thought if i beat say sydney i'd save after wards and then go to beat phoebe and if i did save but that is probably one of the worst things you can do because you get a lot of experience points from beating any of the league members pokemon. you best bet is to just keep trying to fight them. and if you don't want to fo that then you could just go fight the strongest wild pokemon you can. after you beat them the first time. it gets a lot easier. i mean i've beaten them over 100 times and have 5 lv 100 pokemon from it

u can try catching the strongest pokemon u can catch and train them on victory rhode or get game shark or A.R and get a buntch of rare candy to lvl up ur pkeM

You need different types of pokemon in order to beat them...
like:
Raichu level 50
Sceptile level 50
Absol level 50
Ninetales level 50
Rayquaza (of course)level 70
and maybe an ice pokemon like Glaeie for Drake the dragon guy

i have 8 regices. wanna trade?

i have 8 regices. wanna trade?

i have 8 regices. wanna trade?

Find Kyogre and raise to level 75+.Mines 83!!!

Get rayquayza groundon and kyogre and then beat it PS. Bring rayquayza to the ealite 4
like 12 times and it get to lv100 I've done it before and I used the cloning glitch on it
almost 30 lv100 rayquayzas!!!!!!!!!