All fourth generation games can currently download Celebi via Mystery Gift at the Black and White mall tours and at Gamestop stores. Gamestop is even running a commercial for it on TV! The Celebi is at Level 50, knows Leaf Storm, Recover, Nasty Plot, and Healing Wish, and is holding a Jacoba Berry. When downloaded or traded to HeartGold and SoulSilver, it activates an event in Ilex Forest where you can eventually battle Giovanni and learn more about your rival. Once the Celebi is transferred to Black and White via Poké Transfer, you can obtain a Level 10 Zorua. The distribution at Gamestop will end on March 6th, the release date of Black and White.