I've been looking for answers to this problem, but I'm too much of a newbie with rigging to understand some of your answers.
So here's the thing: I'm trying to modelize and animate steelix:
Considering his snake-like shape, he's not so hard to rig and animate, and this is what I made:
But here's the problem: Steelix's spiked boulders can rotate on themselves, and with this rigging, whenever I rotate a bone, the whole body parts connected to this bone also rotates.
What should I do to make that the boulders rotate only on themselves?