First off lol the op says that victini, celebi and jirachi all get speed boosts.
Now for the actual point of this post, I'm here to spread the word of our lord and savior, Combusken.
Combusken @ Eviolite
Ability: Speed Boost
EVs: 72 HP / 252 Atk / 184 Spe
Adamant Nature
- Swords Dance
- Low Kick
- Flare Blitz
- Rock Slide
Speed EVs are for 4 Speed Heatran even though that really isn't relevant it's better safe than sorry. HP EVs avoid the 3hko form Alomomola's scald, the OHKO after rocks from Jolly Durant's Superpower, 3HKOs from the Knock Offs of: (Adamant Black Glasses) Bisharp, Weavile, (Jolly Life Orb) Krookodile, (Jolly and Crunch) Mega TTar, (Jolly CB) Drapion, (Jolly Life Orb) Shiftry, (Adamant Crunch 2hko and Jolly Crunch 3hko) Mega Sharpedo, (+Spe 3HKO Life Orb Dark Pulse and 2HKO Life Orb Fire Blast) Houndoom, (4HKO +Spe Dark Pulse and 3HKO +Spe Fire Blast)  Mega Houndoom, etc. I think you get the point. Also stops most Bug, Ice, Grass, Steel, and Fire-types
For those that do not know, Combusken was recently dropped to nu from bl3 due to the bp clause being added. Some of you might think that the only reason to use Combusken is bp but that's where you're wrong. The Swords Dance set is amazing and terrifying for almost every team archetype in existence, when in tandem with speed boost. We all know that pretty much sd anything viable tears apart balance/stall/slower teams that aren't trick room, and we all know that sanic-speed things eat offense, so why don't we combine both? The lovechild of a slow team destroyer and an offense destroyer is none other than Combusken. The moves should be pretty self explanatory: I don't think SD needs any explaining, Low Kick is there because Combusken's Fighting-type STABS are pretty shitty and Brick Break is piss weak, Flare Blitz is a very strong Fire-type STAB, Rock Slide lures in Flying-types namely Talonflame and Charizard. There are a few downsides to Combusken, but there are a plethora of viable pokemon with these problems. These include its Ground, Water, Flying, Psychic-type weaknesses, all very common types in the tier shift metagame, it has a lot of trouble with Alomomola though if 100% healthy it can pressure Alomomola via sd, and it being pretty weak at +0. All in all Combusken is a solid pokemon in the tier shift metagame and I hope that you guys realize that.
Also 
Snaquaza coded super tier shift and (I think) pu boost ts on aqua.psim.us :O