How you attach game pak on Pokemon Stadium 2?

You can't attach a game pak to Pokemon Stadium 2.

Pokemon Stadium 2 is a game for the Nintendo 64, and it uses a special cartridge that contains all the game data. You don't need to insert a separate game pak to play.

Instead, you can use the Transfer Pak to transfer Pokemon from your Game Boy Color games (like Pokemon Gold, Silver, or Crystal) to Pokemon Stadium 2. This allows you to battle with your Pokemon in the 3D world of Stadium 2.