Hey I can't beat the league and my charzard is at lv. 82 how much more..

Is your Charizard have all fire type??thats why it can't win to a water type. Do not use same type on your team. Moltres sucks ok!!! Vary your team. Psychic,electric, water+ice and grass type Pokemon you need to beat the elite 4. Either that, you screwed up as a trainer.

It really depends, you play the E4 twice. The first time the levels are very low, like normal 40+. So your Charizard shouldn't have much trouble except against Loreli's Lapras. But your team needs a LOT of balance. Don't depend on Charizard and Moltres, use some different types and keep the levels the same. Raise your team to 70~80+. This will help a lot for Round 2 of the E4. The levels are very high like crazy, they go past 60 so train, and bring a lot of recovery items.

Well you may want to train a few more pokemon. Just make sure they aren't fire pokemon. You seem to have that area covered quite well.

Try teaching your Charizard outrage and you should do fine because my level seventyfive rayquaza that has outrage wiped the Elite Four out on Emerald.

1. They are both the same types you need a variaty.
2. You need more then two pokemon.

You need to get that Charizard to level 100, I single handly took my Charizard put it on level 100 and beat the league all by itself.

Give your Charizard these moves and you should be fine.
Flamethower
Wing attack
Earthquack
Dragon claw