There really is no main Legendary Pokemon in Fire Red, but in Fire Red you can capture the following Pokemon
Zapdos: Power Plant
Moltres: Above One Island
Articuno: Sea foam islands- surf down from Fushia City the when you reach the bottom, go left until you reach the islands. You need strenght,surf
Mewtwo: Cerulean Cave- acquired after you get National Dex(60 species acquired)
Raiku: Anywhere in Kanto region(Grass)- acquired after you get National Dex/If your starter is Blastoise
Entie: Anywhere in Kanto region(Grass)- acquired after you get National Dex/if your starter is Venasuar
Scuicune: Anywhere in Kanto region(Water)- acquired after you get National Dex/if your starter is Charizard
if you mean league there is none but if you count the rare Pokemon milotic then no!
The legendaries in Soulsilver are:Raikou, Entei, Suicune, Lugia, Ho-oh, Mewtwo, Groudon, Rayquaza, and Latios.
moltres
(Excluding legendary pokemon) It should be dragonite...
yes but it depends on who and what you are fighting
One of the islanders on this island mentions an extremely rare pokemon can be found in Icefall Cave however this is not a legendary pokemon it is a Lapras which you should already have obtained in Silph Co.
Braille, there is no language called "regi" , regi are the three legendary rock Pokemon and regigigas.
moltres
No
(Excluding legendary pokemon) It should be dragonite...
the 3 birds
Moltres is a legendary Fire and Flying Pokemon. Part of the original trio of legendary birds from the first games, it can be encountered in Pokemon FireRed in Mt. Ember.
There are not many glitches in Pokemon FireRed. There is one rather nasty glitch though involving roaming Legendary Pokemon. In Pokemon FireRed if a roaming Legendary Pokemon escapes battle with the move Roar it will disappear from the game rather than move to a new location.
articuno zapatos moltres and mewtwo
No legendary resides on the islands a rare Pokemon resides on seven island in the tanoby chambers the Pokemon is unown.
yes but it depends on who and what you are fighting
The only type of pokemon that can't breed in fire red are legendary pokemons.
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The legendary birds, Mew, and Mewtwo.