Regigigas Event
Starting today and for the next two weeks (last day March 21st,) participating Toys R Us stores will be giving away Regigigas.
-Comes with a Custap Berry, one of the four event-only berries (Shaymin was holding another one)
-Unlocks Regirock, Regice, and Registeel in Pokemon Platinum (a normal Regigigas caught in-game will not work)
-Has moves Regigigas couldn't normally obtain (Icy Wind and Iron Head)
-Level 100 (which means you cannot train it)
Shaymin Event
Dragonite Event
Gamestop Deoxys Event
http://www.gamestop.com/gs/landing/pokedeox/default.aspx
During the weekends of June 20th through 22nd and June 27th through 29th, go to your local Gamestop and obtain Deoxys!
Japanese Shaymin Event
This info is kind of old, but it's coming up. This Japanese event will give away Shaymin as well as two of the four Event Berries.
Bulbapedia
Owners of Pokémon Diamond and Pearl Versions will be able to download Shaymin during the 11th Pokémon movie, Giratina and the Sky's Bouquet: Shaymin, when they visit Japanese theaters July 19 through Sept. 30. The legendary Pokémon will come at Lv.50 in a Cherish Ball and will be holding a Micle Berry and a Classic Ribbon. Advance ticket holders will also be able to download a Lv.100 Regigigas holding a Custap Berry. Ticket sales begin Saturday and end July 18.
Shaymin's moveset will be Aromatherapy, Seed Flare, Substitute and Energy Ball. Regigigas will know Iron Head, Icy Wind, Rock Slide and Crush Grip.
Micle and Custap berries and Cherish Balls are not found in Diamond and Pearl and can only be obtained through events such as this. Classic Ribbons prevent the holding Pokémon from being traded via the GTS. Both Pokémon will be in Cherish Balls and will hold Classic Ribbons.
Only Japanese versions of the game will be able to receive the two Pokémon. Players will need to bring their own copies of Diamond or Pearl and a Nintendo DS.
Shaymin's moveset will be Aromatherapy, Seed Flare, Substitute and Energy Ball. Regigigas will know Iron Head, Icy Wind, Rock Slide and Crush Grip.
Micle and Custap berries and Cherish Balls are not found in Diamond and Pearl and can only be obtained through events such as this. Classic Ribbons prevent the holding Pokémon from being traded via the GTS. Both Pokémon will be in Cherish Balls and will hold Classic Ribbons.
Only Japanese versions of the game will be able to receive the two Pokémon. Players will need to bring their own copies of Diamond or Pearl and a Nintendo DS.