How can it?It never was and it never will.
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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.
what starter? you already get a starter after you beated red.-_-
It's a starter Pokemon.
Cyndaquil is a starter pokemon from the Johto region and like all starters, it cannot be found in the wild. You receive it as a gift from Professor Elm and it will become your first pokemon. If you want more than one Cyndaquil or chose a different starter and want a Cyndaquil, you’ll have to trade from another copy of HG/SS. If you chose Cyndaquil as your starter and it’s a female, you can breed it and the Egg it produces will be a Cyndaquil. Other than these three methods, it is not possible to obtain a(nother) Cyndaquil.
Luck. You have a 1 in 8,192 chance of your starter Pokemon to be Shiny.