Along side what everyone has said, I highly suggest Pain Split over T-Bolt on your Rotom. you aren't investing into SpAtk anyway so hitting a bit harder really shouldn't be what your Rotom is worried about. Pain Split, however, works very well on just about any non-Choice Rotom (excluding ChestoRest of course lol). With low base HP and a bulky butt, Rotom can gladly take hits only to gain most of that HP back while putting massive dents into other Bulky Pokes and staying around longer.
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