Hi! This used to be asked all the time before the introduction of Charm fast move, first and only so far.
Fairy Wind can be learned by five pokemon released on go: Galarian Ponyta, Galarian Weezing, Mawile, Cottonee and Togetic (& all the evolutions of those). Ideally it’d become another fairy fast move.
The thing is mostly with Galarian Weezing and Mawile. Weezing is completely hindered by only knowing Tackle as fast move, so it’s incapacitated to participate in leagues, and it would totally make a solid pick if not for bad fast move. Now Mawile is definitely useful for the league, but it can only pick off-type roles, using Ice or Fire Fang. Giving Mawile the chance to play as the (metallic) fairy it is would open up a neat option to add to a team.
Charm is nice and all, but I wouldn’t mind getting to choose on some of those pokemon less damage but let out some fairy charged moves or coverage options.
I happen to use 3 of those pokemon and could consider adding Weezing to my roster too