So bulky Altaria is listed at 200 Spe, but I think generally it runs 203 now just so it can get the jump on Mega Lopunny after 2 DDs while it still outspeeds max Adamant Azumarill.
203 / Altaria, Altaria (Mega) / 80 / Neutral / 28 / 0
Tornadus-Therian also sometimes run less than max speed (although max is becoming more and more common) particularly on AV sets to utilize bulk. It runs enough to outspeed Scarf Tyranitar and below. Some creep Adamant Lopunny as well but I think at that point many just opt for max speed especially with the rise of stuff like Alakazam.
365 / Tornadus-Therian / 121 / +Spe / 216 / 0
Diancie's RP set is listed for the mega form but the base isn't listed (well it is, but its listed at 160 EVs), which could be important since it can't protect to mega evolve right away.
180 / Diancie / 50 / Neutral / 176 / 0
Some run 180 EVs instead of 176 so that Diancie can get the jump on base positive natured 115s after a RP but before Mega Evolving (if needing to take a hit). I'm not sure entirely how relevant that is so I'm not listing it, but I thought it might be worth mentioning in case anyone can confirm whether it may be worth listing.