How to rip models from nintendo DS games with ninja ripper or 3d ripper dx

[UserSix!]

I was trying to rip models from a DS game but for some reason I can't rip them from the game. I also tried using MKDS Course Modifier but it only gaves me soundtracks and sound effects from the game but not the models. And the game i'm trying to rip models from is the Johnny Test DS video game (probably you don't know about that game's existence)