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 :
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How to Catch Celebi in Pokémon Crystal | 3DS Virtual Console - YouTube
Pokémon Crystal 3DS Review - YouTube
How to Get Pokemon Crystal on 3DS for Free - YouTube
Pokemon Crystal Coming to 3DS on January 26th - GameSpace.com
My first ever experience of Pokemon Crystal! : r/3DS
You Can Now Pre-Load Pokemon Crystal Via The 3DS eShop – NintendoSoup
Pokémon Crystal coming to 3DS in a cardboard box | Eurogamer.net