Thanks for the info about the nature, is that with max speed investment?Rotom-W should ALWAYS run hp fire! without it all grass types will laugh at you as they set up/kill you
EDIT modest scarf Rotom hits 407 spe, more than enough to outspeed what you need to if you run timid you will be able to outspeed certain scarfed threats though
In my opinion choiced Rotom-W is best at the hit-and-run tactic. Chances are if a grass type comes in for the counter, I'm already choice-locked to something, so simply switching out would be best. I only see HP fire as valuable if you're coming in with Rotom-w as a counter, or if your opponent predicts your switch in. Does that justify the move slot in your opinion?