So I wanted to examine togekiss, and then it spun out into a full blown espeed analysis. so, here goes
1. Dratini
I don't know why you'd want to use an LC in ou, but if you do, don't. Its completely and totally outclassed.In terms of damage, 252+ Atk Choice Band Dratini Extreme Speed vs. 252 HP / 252+ Def Skarmory: 39-46 (11.6 - 13.7%) -- possible 8HKO. If you want to use it, ignore it and hope it goes away.
2. Zigzagoon
Zigzagoon is in a similar position as Dratini, especially since it already had stab espeed. Ignore it.
3. Pikachu
Pikachu, unlike the previous two, has an actual niche. With light ball and electric espeed, 252+ Atk Light Ball Pikachu Extreme Speed vs. 252 HP / 252+ Def Skarmory: 188-224 (56.2 - 67%) -- guaranteed 2HKO. Of course, you wouldn't switch Skarmory in on a Pikachu, but work with me here.
4. Linoone
Bellyspeed at its finest! Except, no it isn't. This gains very little on standard, except in coverage. Linoone wants either a dark/ghost attack to hit espeed's immunities, an actual attack stat, or an electric/fire move to hit Skarmory. Seriously, that bird is wack. Still, a +6 electric/fire return does ohko skarmory- after rocks so that sturdy is broken.
5. Raichu
To its despair, Raichu is once again outclassed by Pikachu. While it does have speed for its non-espeed attacks, Raikou/Pikachu are entirely better. If only fake out and extreme speed were legal on one set...
6. Dragonair
This thing almost has the bulk to set up the three or 4 dragon dances it needs to be good, but instead of multiscale it has marvel scale. Rip, I geuss.
7. Arcanine
As strange as it seems, fire type extreme speed is not the best thing to run on this beast. Instead, you should run ground. Flare blitz+wild charge+ground is perfect coverage. A pure fire role, however, is outclassed by entei.
8. Suicune
Don't run this with espeed. Seriously.
9. Entei
This the best bet for a fire type espeed. While it could play with coverage, the best set fir this thing is pprobably band because it has no boosting moves. Fire is very spammable, and gives nice coverage alongside stone edge.
10. Togekiss
Togekiss once again has stab espeed! Only it still sucks. Unlike metagamiate, it cant run stab pixispeed, so flying is its only hope. With hustle and a choice band, it hits harder than sky plate jolly talonflame bb. It looks cool, too!
11. Lucario
With swords dance, close combat, and a terrifying steel extreme speed, Lucario is ready to roll. While it can run fighting type extreme speed, It misses having a reliable second stab. get a boost, sweep untill they can bring out a counter/wear you down
12. Zygarde
With a newfound dragon stab, zygarde is ready to go to town. Dragon+ground+rock is excellent coverage, while still leaving room for a boosing move.
Coil boosts defense and makes stone edge more accurate, while dd increases its speed to usable levels. That max be unnecesarry with espeed, however. The main draw is that it can easily outspeed and ko dragonite.
13. Raikou
Don't run this with espeed. Seriously.
14. Dragonite
already covered, both in this meta and every other. this is an unholy mashup of aaa and MnM- Stab espeed of two different types, while still having Multiscale to boost. The power drop is noticeable, but probably not crippling.