All you need to do, is make sure you have six good Pokemon, that are really high levels. You should head to a PokeMart, and purchase a lot of heals, HP Restores, and such. Revives will be helpful too. Train your Pokemon to become very high levels, more than level 70, and you should be fine.
you have to start with squirtle and beat the elite 4
Heaps of antidotes and all ledgedarys :)
If you have any friends with ruby, sapphire or emerald or firered or leafgreen have them trade you really strong Pokemon then beat the elite four like that.
hmm, it depends on what cave you're asking about; snorlax blocks a cave in an earlier version, but since you asked in FireRed, I assume you mean cerulean cave. In that case, you just need to beat the elite four and then it'll be open for you.
The oldest Pokemon games to feature Johto are Gold, Silver, and Crystal. FireRed and LeafGreen partially feature Johto after you beat the Elite Four. The newest games to feature Johto are HeartGold and SoulSilver.
Finish your Pokedex And Beat The Elite Four once then the second time they have stronger Pokemon
beat the elite four and the champion.
The best team to beat elite 4 in Pokemon firered and leafgreen are the first six Pokemon you caught and trained
beat the elite 4
beat the elite 4 and then get sapphire stone
you have to start with squirtle and beat the elite 4
Heaps of antidotes and all ledgedarys :)
After you beat the elite 4 in will roam the region
beat the elite 4 alot
you have to get charmander as a starter and then when you beat the elite four in firered you just have to look for him in a random place
No. You need to beat the Pokemon League IN the Platinum one.
Yes. First you have to beat the Elite Four in both games, then do the stuff for Bill in FireRed