If I remember correctly you could play it in “full color” on Game Boy Color, unlike Red & Blue which were only red or only blue.
☆ NintendObs Weekly – Monday, June 15, 2020 – Sunday, June 21, 2020.
Directly to you from Twitter:
At NintendObserver, the comments are on Discord.
Click on Community to learn more. 🙂
…
…Wanna play? Buy a 3DS.
And if you’ve already got yours, click on Pokémon Yellow for everything you need to know about the game. 😀