Is Assault Vest Iron Hands still a thing? What would be the set?
And what other AV users are decent in this meta, besides Glowking, as I would like to use it in conjunction with PivotKing.
I wanted to offer my opinion here as a AV Iron Hands enjoyer.
Invest everything in attack and SPD--With either some extra EVs in speed or DEF depending on the rest of your teamcomp. With very minor speed investment you can handedly outspeed some loose Gambit sets in my experience. Outside that, go Tera flying and run with Drain Punch (sustain)/Earthquake/Ice Punch/Supercell Slam.
The idea is to bait in ground types like Tusk, Lando, gil and then Tera flying to threaten a 2HK or OHK depending on their investments. Earthquake is for dealing with sun teams and/or Ghold, Supercell is a more reliable version of Wild and lets you threaten Hatter with 2HK's if you predict a switch in. You can very easily eat a specs Steam from Walking Wake in sun without much issue, two if you are full HP. You can also do funky stuff like live through a +1 Moonblast from Valiant without much problem.
The best part of Iron Hands is that it pretty comfortably deals with traditional rain teams at the moment; sorry I can't provide calcs but you gotta trust me on that. It effectively deals with a lot of them thru virtue of tanking hits with its sheer bulk and regenning through drain punch. Easily my biggest Tera eater due to flying allowing it to deal with Tusk hard and many other very common threats.
If you wanted an additional suggestion, try AV Hydrapple. It has pretty solid coverage with Hydro/Earth Power/Draco (or fickle)/Leaf Storm. You are very tanky and can hop in and out via Regenator.
What are good teamates for sinistcha? Would raging bolt work as a partner to it?
When I used Sinistcha for a long period I typically paired it with Rillaboom with a grassy Seed set. Assuming all red cards/whirlwinds/etc are all dealt with or denied, you can live through so many SE hits with a typical max DEF/Calm Mind set via Grassy terrain healing. I used Hatt to help cover any toxic spammers or hazards that would overly threaten it, and then tossed in a PhysDEF H.Arcanine into the mix with Wisp. You could probably run a similar team and throw in Raging Bolt to threaten any Flying types until its safe for it to come in and do its job very easily I think. I definitely recommend getting a Wisp spammer to make it overall easier, as Calm Mind lets you pretty comfortably set up in front of Special attackers.