Nothing happens.
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You can only catch it on Gold on route 45.
I think professor rowan gives it to you.
you need to meet professor Elm. he will give you the starting Pokemon.
it stays there in its pokeball forever like it did in the original Gold and Silver games. the pokeball is gone. the game says"no Pokemon left... you wonder who the professor gave it to"
That's pretty much the end of the main storyline. Professor Oak will offer you a starter Pokemon from Generation 1 afterwards.
if you complete your dex you get silver trainer card if you copmplete national you get gold trainer card.
The PokeBall containing the Pokemon that neither you nor your rival took will remain at Professor Elm's desk for the rest of the game. The PokeBall will never be given out for use by you or anyone else.
In Pokemon Gold, after the player defeats Team Rocket and obtains a Rainbow Wing, Professor Elm will give the player a Master Ball. The Master Ball has a one hundred percent capture rate.
no
Its in Pallet Town in Kanto
After you meet him in Mr. Pokemon's house you can again find him in Pallet Town located in Kanto.