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I never really felt very attached to any special Rotom and vastly preferred normal Rotom... until the Sun and Moon anime. I'm only a handful of episodes in but I would die for Rotomdex.
I don't even care about competitive battling- I just liked Wash Rotom from day one. Any time I use Rotom in my party in the games, that's the form I go for, sometimes even as my main Water type.
Rotomdex is cool too, but got a little too repetitive in the games for my liking. Maybe if I was up to speed on the anime, it might crack my #1 spot.
My favorite one? Rotom-Wash, on account of it's Water typing and good competitive usage.
Which one would I use? Rotom-Frost, because it's a living fridge that I can take with me wherever I go, and bolt-beam stab coverage is pretty cool, even if it has to rely on blizzard for ice stab.