Going to be hosting shiny Rotom shortly, in about 30 minutes, hosting for the first time. I'm not locked onto a particular one, but I'm going to start on the lawnmower form.
Squares, should be Timid natured, 13 atk, 21 def, iirc.
Attached poll to gauge whether I should focus on a particular form:
https://strawpoll.com/k8a153r8