Let me think. I don't have Heatran, The 3 elves, I have Moltres,Zapdos,Articuno.Moltres is on my Platinum.Zapdos and Articuno are on my Fire Red. Zapdos,Moltres, and Articuno are catchable in the upcoming games. So are the 3 dogs.
Grouden and Kyogre are in the games. I think one is in each game. Kyogre is in Heart Gold and Grouden is in SoulSilver. Oh so is Rayquaza and the Regis.
So basically I need Heatran,Uxie,Mespirt,Azelf.Creslia, and Palika and Dilgia.That makes 7.
I could send over Moltres,Zapdos,Articuno,Mew,Arceus, and something else. I don't really use Legendarys much. I like to use typical pokemon.