* Pokémon Gold: This is a real game for the Game Boy Color, released in 1999. It's a fantastic game, and you can play it on original hardware or using emulators.
* Pokémon Gold Version (Virtual Console): You can purchase a digital copy of Pokémon Gold on the Nintendo 3DS through the Virtual Console.
* Pokémon: Let's Go, Pikachu! and Let's Go, Eevee! These games for the Nintendo Switch are inspired by Pokémon Yellow, Gold, and Silver, featuring Johto region and Kanto region Pokémon.
If you're looking for a way to play Pokémon Gold, you can either find a physical copy for the Game Boy Color (these are getting more and more rare) or purchase a digital copy for the 3DS Virtual Console (if you have one).
If you're looking for a more modern experience with Pokémon Gold's region, then Pokémon: Let's Go, Pikachu! and Let's Go, Eevee! are excellent options.
Let me know if you have any other questions!