From Serebii.net:
If you were signed up to the Pokémon Hiroba campaign on the official site, you would have been sent this to your cell phone and the official site has since updated with it. On June 16th, in Japan, a new WiiWare game will be up for downlaod for 1500 points. This game is called Melee! Pokémon Scramble!.
Using Pokémon from your games, you control them through various features including a Battle Royal where you control your Pokémon in a massive pit where lots of other Pokémon appear. It's controlled with the Wii Remote on its side or the the Nunchuck and even appears to have a story mode where there are levels which end with a legendary Pokémon Boss
In game, you have the ability to take screenshots of your Pokémon in these fights
It has up to 4 player simultaneous play where you all use Pokémon in the Battle Royale
Passwords are to be used to find rarer Pokémon
I'll bring more as I translate so be sure to check back
