If all you have is a single hydrogen ion (proton? I assume you mean H+), then you will always be able to choose a coordinate system where it is neither moving nor rotating. You can also do this if there is a universe outside.
Alternatively, you can choose a coordinate system where the particle is rotating, accelerating, or moving however you like. Your choice will be determined by the goals you have. (Without the laws of motion, there is no reason to prefer even intertial frames over nonintertial ones.)
Alternatively, you can choose a coordinate system where the particle is rotating, accelerating, or moving however you like. Your choice will be determined by the goals you have. (Without the laws of motion, there is no reason to prefer even intertial frames over nonintertial ones.)