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 :
Pokemon Crystal announced for the 3DS Virtual Console, out on January 26
Pokémon Crystal Version | Game Boy Color | Games | Nintendo
Pokémon Crystal 3DS: The definitive version of the Game Boy's best game
You Can Now Pre-Load Pokemon Crystal Via The 3DS eShop – NintendoSoup
OC ) Pokémon Crystal 3ds cover art Fan-made remake / edited ver. : r/pokemon
Pokémon Crystal and New Nintendo 2DS XL Pikachu Edition out now | Pokémon Blog
Pokemon Crystal 3DS VC Part 1 THE NOSTALGIA AGAIN! Gameplay Walkthrough - YouTube
Pokemon: Crystal Version (Game Boy Color, 2001) for sale online | eBay
Pokémon Crystal Version - Launch trailer (Nintendo 3DS) - YouTube
Pokémon Crystal Version cover or packaging material - MobyGames
Version Differences - Pokemon Gold, Silver and Crystal Guide - IGN
Pokemon Crystal Coming To 3DS Next Month - GameSpot
Nintendo 3DS - Pokémon Crystal Version arrives on January 26th and is now available to pre-order from the #NintendoUKStore! http://bit.ly/2qsvGEV | Facebook
Unboxing] Pokémon Crystal boxed on Nintendo 3DS - YouTube
Here Is This Week's 3DS eShop Chart, Pokémon Crystal Is At The Top (Again) | Nintendo Life
Pokémon Crystal Version - Bulbapedia, the community-driven Pokémon encyclopedia
Purchase Bonuses - Celebi and 3DS Themes - Pokemon Gold, Silver and Crystal Guide - IGN