If you use roms of games being sold, yes.
If for homemade games and such, no.
No it is not, because it illegal is to download stuff for free.
No, the R4 for the DS will not work on the DSi
What!? A DS R4??? Well i presume you meen 'how do you make the DS have an auto boot R4?' (not possible!) Just buy an R4, theres no way you can have a DS what runs roms without an R4 (or any other flash cards) You can buy them here: http://www.r4i.co.uk/ (for both DS and DSi)
As long as it is used for legal purposes.
r4
Buy legal Nintendo DS games. (you won't get any other answers on wikianswers)
An R4 is basically a mod chip for the Nintendo DS console. You can download games from the internet and put them on your R4 card and play the games on your Nintendo DS.
Around mid 2010, R4's and similar DS flashcards, were declared illegal in the UK, despite any legal applications that they can be used for. It is now illegal to import and sell them in the UK.
Someone can buy a R4 DS from the Deal Extreme website. The Deal Extreme website offers a large variety of R4 DS's that can be purchased for any DS system.
no it is not that is a r4 card it for the Nintendo ds r4 card is not legal in most country. as it hurt the benefit of Nintendo and game developer. with the r4 card, user can play most DS games for totally free. they won't pay any money to game developer. So Nintendo is beating flashcard all the time.
The legality of the R4 Revolution for DS device varies by country. In some regions, using the device to play pirated games is considered illegal, as it involves copyright infringement. It is best to check the laws and regulations in your specific location regarding the use of such devices.
Not natively, but you can get a flash card such as the R4 that will let you. Google R4 DS