you can find mewtwo in the cave near where misty is the gym leader
Zapdos: Powerplant
Articuno: Seafoam Islands
Moltres: Mt. Ember
Mewtwo: Cerulean Cave
Entei, Raikou or Suicune: You just have to be extremely lucky. They pop up randomly from grass-patches all around the map. And they're extremely hard to catch.
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No
No legendary resides on the islands a rare Pokemon resides on seven island in the tanoby chambers the Pokemon is unown.
migrate from firered and leafgreen
If you're talking about the legendary Pokemon Articuno, you have to trade it from FireRed or LeafGreen. If you're talking about Delibird, you have to trade it from FireRed.
Well there is no such thing as the best legendary, everybody has his own tastes. The higher leveled legendary you find here is Mewtwo.