Hi, I need help with 3D model editing on DS games.
For example, I am trying to change Tom Nook in Animal Crossing Wild World to the one in New Leaf,
I already have the models needed, and I have already tried to change parts of him, for example, I have changed his face expressions, but they keep corrupting when I change another expression, which is my problem.
I have changed his uniform to his Green Jumper in New Leaf, but I have been having other problems.
Can anyone help me?
I need some guidance with getting this done.

You're going to have issues when you're using models meant for much stronger hardware on much weaker hardware. It's probably a ram issue, try making the new leaf models use far less polygons and less high resolution textures.