Hey guys, just wanna let you know if not already mentioned, that you could successfully inject some Pokemon on the Entree forest of BW2 using the PokeCgear tool. Though the DW Arceus Event data corrupts some of the forest's section when imported and is not advisable to use... Even so, the tool allows an entire legit area in the forest to be populated in the BW2 data file. I guess the memory location of the forest does not differ much from the structure of the original BW games albeit some modifications are made. Afterall, those two games are made of the same Gen V engine.
I also think that it would be super cool if animation manipulation could be added on the PokeCgear to make the Pokemon on the forest have a more "Live" feel to it in the overworld. (Well, by allowing the user to modify the extra bytes mentioned on this thread... though its not that necessary...)
Anyways here are some of the screenshots that I have tested from the game... I only used Area 1 and the Last Area...
[ATTACH=CONFIG]12806[/ATTACH] [ATTACH=CONFIG]12807[/ATTACH]