Which form of Rotom is the most viable in VGC?

Question

probably the washing machine if I had to guess, do state why it is most viable eg movesets type matchups etc

Comments

someone is gonna ask me to ask this on smogon, i think

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You mean reg MB or some other kind of VGC? Also if you have a Smogon account why aren't you asking questions there?

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The rotoms forms only vary in a changed move and typing, no base stat changes. I think wash/heat is the best generally, but frost has a niche on snow teams

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Heat rotom usually works best. It’s a really good pivot with will o wisp

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Wash was used a bunch in ma but I have no idea if any are viable