.NDS graphic ripping

[Wigglytuff]

Hello all, this is my first topic here on the spriters resource. I have only recently started to learn how to rip graphics over the past month or so and i have enjoyed the process. However, i would like to know how to access the original graphic files from games such as Mystery Dungeon Blue and Digimon and save them in a suitable format that can be read by paint. (e.g. .bmp) Before anyone says "They are already ripped for you dummy" i know that, however i would like to learn how to do the process if possible by myself

Thanks in advance,

~Wigglytuff

P.S. This may be the wrong board but for some reason the site wouldn't let me post in the request board