Movie 13 Details

Quote from Bulbapedia:
"Scans from the May 2010 issue of CoroCoro have revealed more information on the Movie 13 Pokémon distributions. The attacks and held items of the alternate color Legendary Beasts have been revealed, as well as an announcement that movie-goers will be able to obtain a Fateful Encounter Celebi at the theater.


Suicune's known moves are Sheer Cold, Aqua Ring, and Air Slash, and will be holding a Rowap Berry. Entei's moves are Flare Blitz, Crush Claw, and Howl, and will be holding a Custap Berry. Raikou has the moves Zap Cannon, Weather Ball, and Aura Sphere, and will be holding a Micle Berry. Additionally, all three Beasts will know Extremespeed.

The shiny Beasts will be available to download from June 18th to August 31st for those who pre-order tickets to the movie, though only one will be able to be downloaded per ticket. The scans additionally revealed that Celebi will be available for download at the theater, starting from July 10th, the movie's premiere date.


This Celebi will know the moves Nasty Plot, Leaf Storm, Recover, and Healing Wish, and will be holding a Jaboca Berry. As it will be received through a fateful encounter, it will be able to activate the special time-travel event in Pokémon HeartGold and SoulSilver, which was previously impossible by legitimate means."
 
So the Celebi event is coming up. I'm not sure whether it will only be available in Japan though!