/3/ - 3DCG

>>688052
Is there any way to paint skin weights so that they move in the *opposite* direction of the bone they are weighed to? Like negative weights or something? Specifically I just want it to move opposite only on the Z axis and to move the same direction as the bone on the X and Y.

I am trying to use skin weights to add butt jiggle to a Resident Evil 2 Claire model mod. To do this, I am just painting weights to the bone of the necklace pendant that bounces around on the character's neck. It looks bad for the ass because whenever the pendant moves or bounces forward, as it makes her butt kind of implode inwards on itself unnaturally. It looks good for the tits though because they're on the front of her body so it just looks like they're stretching naturally / she's sticking her chest out.
Can I paint it so the butt bounces backwards when the pendant bone bounces forwards? Sorry I'm very new to modeling.