Yes, five: Zapdos, Articuno, Moltres, Mewtwo, and ONE of the Johto Legendary Trio (entei, raikou, or suicune) the johto legend depends on the starter you choose. Also, Deoxys, Lugia, and Ho-oh were given away in events.
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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.