You cant. There are cheats to change them into one though. (after having it) Ido not know the code but i have seen it before
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I put a link to a guide all about legendary pokemon in HeartGold in the related links.
what starter? you already get a starter after you beated red.-_-
No it is a starter in the johto region.-evolved from a starter
In HeartGold and SoulSilver, she does not battle you - which might be one of the reasons why she doesn't have a starter pokemon. Instead, she has a Marill.
It's a starter Pokemon.