Okay, I will try to keep the bitter hatred of this stupid word out of my post okay this is really just a platform for me to vent about how much I hate formes [sic].
In all cases I can think of off the top of my head we've followed Nintendo's spellings, etc., and I guess to be consistent we'd follow here, but not only would that be really difficult to get people to keep doing but it's just plain incorrect. It looks absolutely awful and unprofessional, and it's a completely arbitrary 'e' in the first place. If we were using formes, iirc we'd have to capitalise the F too, which would just be even worse: 'alternate Formes of Rotom' oh my God this is not the middle ages. Nintendo weren't always doing it, anyway, although that';s not a brilliant argument as then we could probably still say Hypnosis has 70% acc. Formes seems more of a specific noun to me, too, so we could simply avoid it and just treat forms like a separate name, as if it was the word 'varieties' or something, as opposed to using the official word 'formes'.
Also relevant to 'Small Nitpicky Things That Don't Matter But I Would Like to Know for Once and for All', Underused, UnderUsed, or underused? Mekkah and GS gave contrasting answers iirc. Personally I just prefer Underused when referring to the tier [or UU], and 'underused' when referring to the Pokémon's usage/the 'underused environment'.