-> UR; Sadly, this little fella is just no longer needed. Between Tornadus, Alolatales and Grimmsnarl there's no reason to use this over any of the previously mentioned Pokémons. Screens? Grimm and A9 are right there; Encore? Again, A9's got you covered. Not only that, but these Pokémons aren't as passive as a Shuckle waiting for its team to set up Trick Room and Power Trick; Stealth Rock? I'll be honest, I'm short of that but it's not like hazzards are the most vital part of Double Battles. This guy just hasn't been outclassed, it's been rendered obsolete, and has been power crept and speed crept like hell after the recent DLC.
-> T5; This thing is... weird. The combination of Tail Glow and Take Heat automatically make it usable, but it's just too easy to focus on and doesn't really have the coverage needed to take on mons like Volc, Wake and Waterpon. It also has a pretty mediocre SpA stat, being unable to OHKO Cress and AV Hands at +3 with Rain and Tera, let alone 2HKO them without those boosts. However, a +3 is still a combination to fear, especially now that it has Baton Pass, which thanks to its good bulk and speed can allow it to pass it to much better threats. It also has decent utility with Knock Off, Haze and even Heart Swap. It's just a very niche mon that only works in very specific scenarios, but when it does it pays off massively.
-> T4; He's big, he's fat and he's back. Sadly he isn't doing much, but he does just enough to guarantee not being a T5 unmon. What is his role? Belly Drum mostly, but thanks to Thick Fat it can "resist" powerful moves from the likes of Bundle, Chi-Yu, Armoruge, Torkoal and even Chien-Pao if it's running a tera to resist Sacred Sword. In fact, talking about terastalization, it pairs significantly well with Thick Fat, and allows Snorlax to more easily make use of its gargantous bulk to eat moves through resist. It's also base 30 speed which allows it to underspeed Kingambit, the Ursas and Hands under Trick Room, as well as speed tieing with Amoonguss; and although Tork does hit first under TR, Snorlax's Thick Fat and massive special bulk allows it to take Tork's Eruption with no trouble. However, it does have lots of disadvantages: although it's much easier to not immediatly die after using Belly Drum, it is much harder to achieve those conditions; Snorlax also suffers from being not very threatening, if at all, before using Belly Drum; lastly, its monotyping and low attack stat make it hard for it to ensure an OHKO on mons like Hands and Ursa without having to invest heavily in its attack stat. Also heavily contests with Hands and Luna, which is hard to do when you're Snorlax.
-> T3; Where do I even begin with this little fella. Guy has 2 incredibly good abilities in Heatproof and its signature Hospitality, so it can choose between turning a main weakness into a neutrality (or even a resist with Occa Berry) or supporting its team via immediate and unblockable 25% heals. Its natural typing isn't THAT good, but Fake Out immunity and grass resist is always appreciated. Stats wise it is a pretty well balanced Pokémon, as its biggesst stat is its base 121 SpA. It has VERY average bulk, which is one of its main problems, and its Speed is very akward, but all of this can be overlooked in favor of its main attraction: Matcha Gotcha. This move is so dumb; it has a 20% chance to influct burn, recovers 50% of the damage dealt AND it is a spread move. Of course, 90% accuracy makes it somewhat harder to spam, but it is still a hard move to switch into since you have to be careful with switching in something that doesn't care about burns AND doesn't take neutral or worse damage from Grass to prevent it from healing up. Sinistcha also has a ton of utility thanks to Rage Powder and Trick Room, which means it is not a 1 trick pony, and has other means of recovery in Life Dew and Strenght Sap. It also can set up with either Nasty Plot or Calm Mind, to become incredibly threatening, in tandem with other moves like Leaf Storm, Shadow Ball, Energy Ball, Hex or even Scald for either strong STAB alternatives or coverage in the case of Scald. Overall, a mon with a dumb movepool and dumb abilities held back massively by a poor typing and poor stats, and also very poor non-STAB coverage.
-> T2; After being unbanned, this chonk has proved to not be as threatening as it was back when it first introduced itself to the meta. Between brand new mons and the metagame itself changing, counterplay against Ursaluna is much more available and easier to use. However, this doesn't mean that it is been powercrept by these changes. Although it is still restricted to Trick Room, Ursaluna keeps being damn good at its job. Facade and Headlong Rush are still terribly dangerous, and Earthquake is a nice spread move to use with teammates like Landorus, Cresselia or Tera Grass/Flying Indeedee (who also cancels Grassy Glide's priority); but if Trick Room is out of the question, it is still a very good user of redirection support from the likes of Amoonguss, Sinistcha and Waterpon. The damage output it has is massive, and KOing it is no easy feat, however between its constant chip damage, all the brand new counterplay, the reintroduction of Grassy Glide and all the strong priority in the tier (see Chien Pao + Kingambit), Ursaluna can now be kept it in check. However Ursaluna is still a Pokémon that can spiral out of control very quickly, and its presence is very much so respected on the field. Still mad dependant on support, but crazy enough to pull it off.
-> T1; this thing is absurd, there is no contesting that, she deals obscene damage while still being fast as hell and relatively bulky for the damage and speed she has; the fire goblin also has a ton of random utility like Knock Off, U-Turn and Follow Me and has out of pocked coverage like Stomping Tamptrum, Brick Break, Superpower and Play Rough and also has all of the 3 good Grass STABs + Glide.