Can any high-level player explain to me why Non-Mega Gardevoir isn't ranked in OU? I remember reading a while ago that it was basically the only good scarf fairy, and... well, that does seem rather solid in general. While it's never reaching the levels of power it's Mega form is, 125 Special Attack backed up with Fairy STAB and a decent movepool is very solid. I can see a set like...
Gardevoir @ Choice Scarf
Timid Nature
4 HP/252 SpA/252 Spd
Moonblast
Psyshock
Focus Blast
Trick/Memento
Working really well to outpace dragons and really mess with them, as well as obliterating stall 'mon like Mega Sableye without taking up your Mega Slot (Mega Voir) or being really slow (Sylveon).
That said a Scarf Gardevoir was discussed a while ago and there has to be some reason it wasn't considered at least D-rank by now, and of course I'm not an experience player so I would be interested to see the reasons why Scarf Voir didn't go through.
Edit: A few calcs
252 SpA Gardevoir Moonblast vs. 4 HP / 0 SpD Latios: 278-330 (92 - 109.2%) -- 56.3% chance to OHKO
252 SpA Gardevoir Moonblast vs. 252 HP / 4 SpD Mega Sableye: 270-318 (88.8 - 104.6%) -- 25% chance to OHKO
252 SpA Gardevoir Moonblast vs. 0 HP / 4 SpD Gallade: 270-318 (97.4 - 114.8%) -- 81.3% chance to OHKO
252 SpA Gardevoir Moonblast vs. 0 HP / 4 SpD Mega Lopunny: 312-368 (115.1 - 135.7%) -- guaranteed OHKO
I should also mention that with a Scarf, Gardevoir outspeeds fully invested positive natured 135s like Lop.