You can catch one of the three legendary dogs; Bulbasaur=Entei, Squirtle=Raikou, Charmander=Suicune. you can catch them in vermilion city, fly to vermilion city and go north, you can find them in the last rows of grasses in the upper part of vermilion,
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By beating the elite for then Beating the champion.
after beating lt. surge, you ll get it with thunderbadge
hes is the pokemon league champion
Go to Indigo Plateau, battle the Elite Four and the Pokemon Champion.
Take them to Four Island after beating the Elite 4. You leave your Pokemon with a Ditto in the daycare and they'll have an egg eventually.