if i were you i would go with blazikien or camerupt because they are powerful but i would eliminate legendary pokemon.
moltres and entei are the best but if you have charizard (not traded) you cannot get entei
you can get it at the safari zone it is a bug type Pokemon but i would not catch it, it is weak.
Charcoal raises the power of fire type moves by 10% from generation I-III, therefore including FireRed.
There really isn't a strongest. For that all depends on the stats, level, and of course moves. Charizard is a good fire pokemon, but so is Arcanine!
The best way to get Dragonair in Leaf Green or Fire Red is to envolve it from Dratini. You can get Dratini in The Game Corner in Celadon City ( The city where you battle with the GYM 4 Erika Grass TYPE).
In Pokemon mansion you can catch a growlithe and you can get a flareon( you need to evolve the evee with fire stone). By the way you can get an evee at the apartment(last floor) in the celadon city.
There are 3 starters that you can choose at the beginning of Pokemon FireRed and LeafGreen version. You can choose Bulbasaur (Grass type), Charmander ( Fire type) , and Squirtle (Water type).
Go to Google and type in [Pokemon Fire Red Pokedex list] or [Pokemon Leaf Green Pokedex list].AnswerVisit http://bulbapedia.bulbagarden.net/wiki/List_of_Pok%C3%A9mon_by_National_Dex_number and read up to the Sinnoh Pokedex. These are all the Pokemon available in Pokemon FireRed and LeafGreen.
fire
To get the fifth badge in Pokémon FireRed and LeafGreen version you have to beat Koga. He uses poison type Pokémon.
A grass type, A ground type, A fire or flying type or both, A psychic type, A water type/ground type/rock type, and any legendary.
you can get it at the safari zone it is a bug type Pokemon but i would not catch it, it is weak.
In Sapphire, there is Electrike, Manectric, Pikachu, Pichu(breeding), Raichu(evolve), Voltorb, Electrode, Plusle, Minun, Magnemite, Magneton, Chinchou, Lanturn, Zapdos(trade from FireRed or LeafGreen), and Jolteon(trade from FireRed and LeafGreen).
in the Pokemon mansion that is where than is on cinnabar island
Charmander is a fire type of Pokemon. To get a Charmander egg in Pokemon FireRed, you can breed Charizard with Ditto.
if you want a cheat on how to get a mew on your first trip to cerelean city go to youtube and search how to get a mew in leafgreen or firered. or simply type mew(never tried that) ^^
Squirtle (Water type) Charmander (Fire type) and Bulbasaur (Grass type)
Charcoal raises the power of fire type moves by 10% from generation I-III, therefore including FireRed.