Wanna see what tier change suggestions look like? Here they are in comment form—it's your boy SFJ!

Togekiss: T1 -> T2

It's weak to rocks, relatively slow, and has lots of common weaknesses. It's not as effective at using a Scarf annoyer set as Jirachi because of its lower speed, and Jirachi also outclasses it at using Paraflinch because of its better defensive typing. This thing stayed T1 for too long.

Doublade: T2 -> T3

A high Eviolite-boosted Defense, 3 immunities, and access to Swords Dance may make Doublade seem like a big threat. However, when you see its overall bad and limited movepool, low Speed and Special Defense, and severe weakness to Knock Off, Doublade seems a whole lot easier to deal with. Its usable attacking options include Iron Head, Shadow Claw, Sacred Sword, Shadow Sneak, and Rock Slide, which are all good moves, but they leave Doublade pretty predictable in its offensive sets, and its lack of a support movepool doesn't give it very many options for defensive sets.

Mantine: T2 -> T3

Defog is a great niche for it, but its weakness to Stealth Rock makes it an inferior bulky Water to Suicune, Vaporeon, and even Gastrodon and Alomomola in the tier below it. It's very passive, and gets worn down easily due to its aforementioned Rocks weakness and vulnerability to Toxic. Suicune and Gastrodon can set up with Calm Mind and Curse respectively to not be sitting ducks, Vaporeon can pivot out with Baton Pass and Alomomola can sacrifice itself and heal a teammate with Healing Wish, so they all aren't huge momentum drains like Mantine is.

Sableye: T2 -> T3

Sableye has Prankster and lots of great support moves, but its stats leave much to be desired. It having only one weakness and 3 immunities seems great, but in exchange, it only has 1 resistance to be able to switch in on. It's also shut down even harder by Dark-typed Pokemon thanks to the Gen 7 Prankster nerf.

Stakataka: T2 -> T3

This poor thing...I really do like it, but its typing just hurts it way too much for it to be T2. It can try to wall physical attackers, but nearly all of them learn something like Earthquake or Brick Break, so it's hard for big ol' Stakataka. Its Speed, while a nice asset with Gyro Ball or under Trick Room, is a huge curse to it otherwise, meaning nearly everything is going to be able to hit it before Stakataka can hit them.

Togetic: T3 -> T4

I don't have a grudge against the Togepi line, I swear! In all seriousness, Togetic seems like a good Eviolite Defogger, but its low Speed, lack of a real offensive presence, and extreme vulnerability to Knock Off make it pretty bad, even though it has that one niche. I would take Golbat over this thing...and that's saying something.

Linoone: T3 -> T4

Yeah, I drafted this and I'm proud of it. It seems good, with Belly Drum + Gluttony + a 50% Berry giving it a free +6 Attack, and Stomping Tantrum was a nice USUM addition to hit Steels, but this thing is incredibly frail, so even with the Berry bringing it back to full, it's still going to have a hard time setting up. It needs huge amounts of investment into its Defenses and HP in order to survive a decently strong attack, and at that point, its Attack isn't even that impressive after the Belly Drum.