Ok, so this basically makes it so Mario does not look weird while doing a falcon punch, Samus not shrinking when using a taunt for Mario, or anything that is an animation from a different character. *Pics will come later*
Step 1.) Open your model you want the animations for in Brawl Box
Step 2.) Preview the model
Step 3.) Open the FitMotionEtc.pac of the character you WANT AN ANIMATION FROM
Step 4.) Go to the animation and export it
Step 5.) Open the FitMotionEtc.pac of the character you ARE VIEWING THE MODEL OF
Step 6.) Go to the animation you want to replace and import the exported animation over it.
Step 7.) Go to the first frame, and on the side click INSERT
Step 8.) Go to Wait1
Step 9.) Go to frame 1
Step 10.) On the left side, open up the Bones section and click on TopN
Step 11.) On the right, click COPY
Step 12.) Go to the IMPORTED animation and press paste (Make sure you are on frame 1)
Step 13.) Check and see if all the frames are not stretched
Step 14.) Save
If you need help, post a question. Pics will come later