GLISCOR - If you want to run a 252 Atk/252 Spe/4 HP Gliscor, (which I wouldn't recommend), give it a Jolly nature to outspeed more stuff, making the 252 Spe EVs more useful. However, the set I would recommend is the smogon suggested set, which suggests a Jolly Nature and 252 HP/68 Atk/188 Spe EVs. Protect is completely viable on Gliscor, but generally people like to run Roost over Protect for instant recovery instead of gradual recovery. The choice is up to you, but I think Roost would be the wiser descision. Stone Edge is also viable, but Facade, while admittedly having no coverage, offers an incredible amount of damage when stacked with Swords Dance and the Toxic Orb.
DARMANITAN - No, you shouldn't replace Darmanitan with Infernape because Darmanitan has Sheer Force, but Infernape's ability is situational at best, and useless at worse. Infernape, on the other hand, is faster than Darmanitan, but this is easily remedied by giving Darmanitan the Choice Scarf instead of the Life Orb. If you choose to do this, I would recommend changing your set to suit a Scarf set more. Replace Fire Punch with Flare Blitz for more damage. Use U-Turn instead of Zen Headbutt to scout out your opponent.
TOGEKISS - Even though this particular Togekiss is holding a Choice Scarf, Togekiss's speed stat is very low compared to other pokemon in UU, so you should replace it's Modest Nature with a Timid Nature to outspeed more. This is especially important because this set relies on getting a lot of Air Slash flinches, but you can't flinch at all if you're slower than your opponent. Replace Tri Attack with Trick. Trick is a much better move on ScarfKiss because tricking a Choice Scarf onto an opponent gives you complete control over your moves, and effectively gives your opponent a permanent Encore.
SCIZOR - Scizor has excellent defenses of 70/100/80, and as such doesn't need a Focus Sash. Normally I'd suggest running a Choice Band, but at this point you already have 2 choiced mons, so I'd suggest a Life Orb. Another benefit to running a Life Orb over a Choice Band is that it gives Scizor the ability to run Swords Dance. Also, because Scizor's highest defensive stat is it's defense stat at 100, so you should invest your leftover 4 EVs in Defense, not HP.
HAXORUS - First of all, replace Haxorus's Adamant Nature with Jolly to outspeed more. Dragon Tail has -6 priority, only 60 Base Power, and is completely awful on a Dragon Dance sweeper. Instead, give it Dragon Claw for higher Base Power and 100% accuracy (Dragon Tail only has 90%).
MANETRIC-MEGA - For some reason your Mega Manetric is missing a nature, so I would suggest Timid to outspeed more pokemon. Next, I would reccomend replacing Flamethrower with Fire Blast for more damage at the cost of accuracy. The whole point of Hidden Power is to offer coverage for pokemon that lack good coverage moves, but Hidden Power Water offers almost no coverage that Hidden Power Ice doesn't do, and better. Because of this, I would swap HIdden Power Water for HIdden Power Ice.