You give it to a Porygon and trade it, to get a Porygon 2.
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in the silph co. building.
To upgrade your radio in Pokémon Gold, go to the radio tower in Lavender Town. There you will be given the radio card.
In Pokemon Gold, Team Rocket has been defeated and the Silph Co. office building is mostly empty. The player can go inside and find an Upgrade item however.
Get all 8 johto badges, beat the Pokemon league, then return to New Bark Town and Oak will be there. He will then upgrade your pokedex.
You have to renew you account then get gold