Yes you can!
they dont want to reset they can use backups.
Of couse, the game is not on the ds or dsi. It's a game card
yes the action replay Dsi has already came out it's available at game stop
Well, any game that you can buy on the DSi store is not a DS game, such as "The Minis March Again." There is a DSi-only game which requires the camera to play, it is called Monster Finder and cannot be played on a regular DS (though it should work fine on a DSi).
Yes, it came out April 5, 2009.
Yes. It is a DS game, with DSi-enhancements. Because of this, the game is region-locked when played on a DSi, DSi XL or 3DS. This does not apply when playing on a DS or DS Lite.
Yes
yes just push the format botton on the dsi settings
Yes, you can do a full reset. The new firmware won't be wiped, it's on a protected part of the DSi's memory that won't be removed if the console is reset.
Probably not because you already played it then everyone would do that to get free games
it is already out for ds, dsi, wii, xbox 360, ps3, etc.
The DSi doesn't have a gameboy slot, so GB, GBC or GBA games can't be played on it at all.