Bastiodon actually has a good range of special moves such as Ice Beam, Thunderbolt, Fire Blast and Flash Cannon (for Fairies), as well as great physical moves like Earthquake. Slap an Assault Vest and it can do some work with a 138 Special Defense stat (or a 168 Defense stat if another teammate is using Assault Vest). I find it's a great answer to Boomburst Swellow- it hasSoundproof to completely block Scrappy Boomburst. Otherwise, Sturdy is also useful for a 2 turn guarantee (barring Fake Out/hazards) since Rock/Steel is such an unfortunate typing.
Oranguru has some interesting coverage for a Psychic type. With a 110 Special Defense, you can use Assault Vest and have the choice of Psychic/Psyshock, Shadow Ball, Thunderbolt, Energy Ball and now Earthquake/Rock Slide to the mix if you need it.
Ledian....is still bad but this will be as useful as it can be. It can now actually use Iron Fist! It can utilise its highest stat- a 110 Special Defense and combine it with Assault Vest. It has access to all the elemental punches for some good coverage (Thunderpunch/Icepunch is solid while Fire Punch is great for Steels). Mach Punch for some priority revenge killing while Drain Punch can surprisingly heal a lot against the right target. Knock Off is also great utility. It's best STAB move is Bug Buzz (although U-turn pivoting can be decent). Unfortunately, it doesn't learn any good Flying moves. But yeah..now with Item Clause, someone else probably needs Assault Vest anyway.
Drampa's known for its great movepool, but now it has the chance to use physical coverage as well! It has respectable 91 Special Defense so you can arm it with an Assault Vest to soften blows from Electro Ball (that poor 36 Speed..). It can now use moves such as Earthquake and Play Rough (very nice offensive types) to add to the nice coverage of Special moves such as Ice Beam, Thunderbolt, Fire Blast, Shadow Ball, Draco Meteor, Hurricane, Focus Blast and Surf.
Probably for a Trick Room team, but Rampardos has a great special movepool that it can possibly use. Fire Blast, Ice Beam and Thunderbolt can be used with Sheer Force variants, and it also has access to Surf. There's also Focus Blast if you're being ballsy (hey you're using Rampardos) but Hammer Arm is probably better for a Trick Room sweeper.
Alakazam can have a callback to the GSC days and use the Elemental punches if you want specific coverage like the more accurate Fire Punch for Steel types (i.e. Scizor).
Nidoking can now use its higher base stat to deal more damage with Sheer Force. Choose from Earth Power, Ice Beam, Thunderbolt, Fire Blast, Sludge Wave or Stone Edge.
Skarmory ruining Machamp's day? Let out a No Guard Fire Blast and roast that metal bird away! No Guard Focus Blast can also be fun- with the same PP, you don't have to worry about Close Combat's Defense drops.
Mega-Mawile can now add Fire Blast to its arsenal for Steels who resist its STABs, or Ice Beam for defensive Ground types.