I'll take a quick guess that this is about Pokémon Battle Revolution, and explain in more than 4 words (and a release version) what we have at the moment, and what we'll need to achieve DS->Wii compatibility for Slot-2/R4 devices.
Right now, we have, as arctic_flame said, homebrew applications to dump the save files from an original cartridge over to either a flash cart, or directly to a PC, and we have the power to put a save back into that place (an original cart). What we'll need, and I don't know if that is possible, is something that'll read what pokémon we have in our team/boxes (that we have, look at PokéSav) and create/append a battle pass(or a whole PBR savegame, anything will do) that'll be able to be transfered to the Wii using SD cards.
At the moment, that's how I think we'll be able to go around the problem we currently have with Pokémon Battle Revolution.
Now, if what you were referring to with this post was not Pokémon Battle Revolution, and I don't really think I'm wrong, but it could happen, even though the post date matches with the release of Pokémon Battle Revolution, then I'm sorry and please disregard what I said...
Cheers, and here's hoping for a solution to play with the little guys I specially trained just to play PBR
Chlikaflok