You can capture Mewtwo in Cerulean Cave B1, Zapdos in the Power Plant, Articuno in Seafoam Islands B4, and Moltres at Mt. Ember Peak in FireRed.
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Zapdos, Articuno, Moltres, Raikou/Suicune/Entei (depends of which starter Pokemon you choose) and Mewtwo and Deoxys (event only) and Luigia and Ho-oh (also event only).
Charizard, Zapdos, Articuno, Mewtwo, Vaporeon, Gengar.
Articuno: Snowymountains, Moltres: Extremehills, Zaptos: ForestHills, Mew: Jungle, Mewtwo: Plains
You can catch Suicune, Entei, Raikou, Lugia, Ho-Oh, Celebi, and Mewtwo, Moltres, Zapdos, and Articuno.
Zapdos, Articuno, Moltres, Mewtwo, Entei/Raikou/Suicune (depends on what starter you chose).