The best official way to play Pokémon Crystal because the save battery won't die and you can now transfer to a 3DS game for free, also restored Celebi and wireless battling : r/3DS
Pocket Monsters Crystal Version - Virtual Console - January 26th, 2018 - PocketMonsters.Net
Pokémon Crystal has Launched on the 3DS Virtual Console
3DS - Virtual Console - Pokémon Crystal Version - The Spriters Resource
Pokémon Crystal - Virtual Console Reveal Trailer - YouTube
My 16-year-old Pokémon from Crystal will join me in Ultra Sun | PokéCommunity Daily