you dont find the legendary dogs in fire red. instead you get the legendary birds. they are zapados moltres and articuno
No
None of the legendary dogs are available in Emerald you must obtain them from Firered, Leafgreen, or Pokemon Colosseum.
migrate from firered and leafgreen
no you cant and how would that even work.
gatch them with a master ball but trade the master balls
You need to migrate each from either firered or leafgreen or you can trade with heartgold and soulsilver after they got them.
You have to trade it from FireRed or LeafGreen
it depends on which starter u chose. squirtle: raikou. bulbasaur: entei. charmander: suicune.
You can only catch one of the dogs which depends on what starter you chose to get the rest get one from firered to get the second and the third from Pokemon colosseum.
Mew Mew2 Zapdos Moltres and Articuno
No!
Try to catch them all.