I don't think you need any homebrew to play other region games on a flashcard. If you mean you're going to get a retail copy of the Japanese version, I don't think a way to region-unlock on the DSi exists, at least not with a homebrew file.

 

There's no DSi homebrew that can make your DSi region-free.
Sorry!

 

You're going to have to wait untill it comes out in your region.

 

it's the DS hardware, not the flashcart/firmware.

 

Now that you have read that, you should know that you are using a flashcart to play the rom...flashcarts run in DS mode regardless if it is in a DSi or not...DS mode does not have a region lock, thus flashcarts have no region lock...thus, there will be no region lock with your horrid pirated game and nor will you have any of the DSi enhanced features.

 

that's because those are DSI games. you can't play dsi games on a flashcart.
dsi ENHANCED maybe, but not full dsi games.

 

I know I'm late, but just to clarify:
DSi-Enhanced games play on DSi flashcarts (although the DSi functions won't be available, as it'll think you're playing on a DS lite)
DSi games don't work on flashcarts yet
DSi and DSi enhanced games are both region-locked (but DSi-enhanced will play on any region on a flashcart or DS lite)
Since Pokémon fits into the "enhanced" category, it will work on a flashcart (but there's a possibility that anti-piracy measures will prevent it from working for a few days)

 

i hope they will make some kind of homebrew for a region free for DSi

 

Wait; what?? Only the downloadable DSi games and programs are region-specific. Pokemon Black and White should be playable on any Nintendo DS system, as far as I know.

This hasn't changed, has it?