240 is relevant for HP Ground, which is rare, but can be used for Heatran + to outspeed Bisharp. I personally don't like it, but I think it's worth mentioning.239 / Bisharp, Breloom, Metagross, Mega Swampert / 70 / Neutral / 252 / 0
Timid HP Fire Magnezone hits 239 as well, if that's relevant enough. It speed ties with Bisharp which is pretty important. I doubt anyone uses non-HP Fire Magnezone, though, so 240 would be a bit weird. I suppose it'd look like this:
239 / Magnezone / 60 / +Spe / 252 / 0 / 30 IV [Hidden Power Fire]
Not necessarily; if it's against a slower opponent without priority such as Slowbro, Mega Sableye, Dragalge and such it can just U-turn right away.Beedrill's speed never really comes into play because it always uses Protect to Mega Evolve, so Mega Beedrill's speed is the only relevant one.
RP Lando doesn't run a +spe nature (unless it's just for opposing to lando but that's eh), and I already made a note of this speed tier on the last page :sRock Polish Landorus needs to be added especially since it's a very relevant threat.
662 / Landorus / 101 / +Spe / 252 / +2
602 / Landorus / 101 / Neutral / 252 / +2
180 is definitely needed for RP Diancie as it can take a hit with defences of its non-mega form, RP, then outspeed and start kicking behinds - this allows it to set up against Raikou, Gengar, and Latis while taking less damage.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.