CGA President, Tribe of Judah Founder & President
Source: http://www.pokemon20.com/en-us/mythical.html#marMARCH 1–24 |Nintendo Network
The second Mythical Pokémon of the Pokémon 20th celebration is Celebi, who debuted in Pokémon Gold and Pokémon Silver for the Game Boy Color. Now Celebi is once again available for a limited time via Nintendo Network! This Celebi has the same moves as the original Mythical Pokémon and is ready to confound its foes and support its teammates in battle!
Receive Celebi via Nintendo Network beginning March 1, 2016, for your Pokémon Omega Ruby, Pokémon Alpha Sapphire, Pokémon X, or Pokémon Y game. The Pokémon will be available only until March 24, 2016, so don't miss this opportunity!
You don't have to step foot inside a GameStop for this one. (Huzzah!)
So go get it if you have already!
Tagging @Kendrik on this so he's sure to see it.