even easier than that; in BrawlBox, expand the MDL0, expand the Bones list, right-click the TransN bone, and "Add to Next Up"; then scale the bone that is now its parent; for most characters, this is the EyeYellowM bone; you may also have to rename the parent bone(AKA the EyeYellowM bone, usually), but tbh I don't remember; it's been a while since I've done one-slot resizing
Don't scale it in Max, because the scaling is either via one-slot resize, like I just said ^, or it'll be through the animations; so make sure you do it through BrawlBox, like above
Thank you very much!! You actually rename the EyeYellowM bone, move it right on top of the TransN bone and click add next up on TrasN. Then scale the renamed EyeYellowM bone. You shrink back to normal size if you get grab thrown and the character is misaligned when grabbing the ledge.