It won't work with AC:WW on any flashcart, and it never will without some serious hacking. Unlike the Pokeyman games, the AC connectivity is done via download play. The Wii game runs some software on the DS, and that software looks for the DS game pak. No flashcart update will be able to make a flashcart look and act like an official game pak when it isn't even running.
The best bet would probably be for someone to capture the DL play app and use it as the basis for a homebrew app that would take it's place, and read the AC save file from the flashcart instead of looking for the save on the actual game pak.