no you cannot buy game corner coins in the newer versions of Pokemon gold and silver anymore.
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You can get it at Seafoam Islands or buy it with 10,000 Coins at the Goldenrod Game Corner.
In Goldenrod city Game Corner, you can get Thunderbolt for 10,000 coins, or go to Cerulean Cave.
You can not buy Pokemon from the game corner in Pokemon diamond, but you can in heartgold and soulsilver
You can find the TM Flamethrower in the Game Corner in Goldenrod city for 10,000 prize coins.
You must win it at the Celadon City Game Corner.