For the first time at least all Pokemon should be level 55 or higher.
go back to them and chalange them again
your strongest Pokemon
You can challenge other trainers with Pokemon you raised. Challenge Gyms for a challenge and to progress. Defeat your rival _____ (insert name you gave him). Eventually, make your way to the top and face the most challenge: The Elite Four!
The best way is challenge the elite four with your Pokemon or a Pokemon holding exp. share. The better is to use gameshark codes for rare candies.
No its not an HM in leafgreen.
The best team to beat elite 4 in Pokemon firered and leafgreen are the first six Pokemon you caught and trained
Machamp, Alakazam, Gyrados, Articuno, Ninetails, Victreebel.
just train your Pokemon each to lvl 55 and you should have no trouble
To open the Elite Four, you have to get all the Gym badges.
After you defeat the Elite Four.
train your Pokemon that's it.
Beat the elite four.