I think I can talk about Shell Smash Torterra for a bit and give a quick opinion on Trick Golurk. Torterra by itself is already a monster, but with Shell Smash it would be on a whole other level. Torterra has a nice base 56 Speed tier that with a Jolly Nature and after the boost from Shell Smash would be able to put even the popular Scarf Rotom-A in its place, outspeeding it by a healthy amount. Unlike Gorebyss, Torterra's good Grass/Ground typing and great 95/105/85 defenses allow it to easily set up on a variety of Pokemon such as Golem, Regirock, and Rotom-S (When locked into Volt Switch) and destroy with its coverage in Wood Hammer, Earthquake, and Stone Edge. The fact that it has such a great STAB combination, ease in setting up, and its general bulk would make Torterra a centralizing force in the metagame as soon as it would come out. Following Torterra's prophetic appearance, Tangela would instantly turn to the spotlight once again as the most solid Torterra counter available while Amoonguss would be left in Tangela's shadow for a change. Usage from certain Pokemon such as Golem, Rotom-A, and Alomomola would decrease in favor of Pokemon that doesn't give Torterra such as easy time. Regirock would adapt and carry Ice Punch to prevent Torterra from freely getting up as many boosts as it can and Zebstrika would become a considerably more popular as a Scarf Pokemon. Zebstrika has the ability to revenge kill Torterra after a bit of damage with Overheat while still being capable of checking Gorebyss just the same, a huge thing to be able to claim in this what-if metagame. Speaking of Gorebyss, I could see Dual Shell Smash teams featuring both Gorebyss and Torterra as they hold excellent synergy together and hit on the opposite side of the spectrum-Gorebyss special and Torterra physical. The kind of teams would be incredibly dangerous and both Torterra and Gorebyss fish out each other's checks/counters such as Gorebyss beating Tangela and Torterra smashing Rotom-A, Mantine, and Seismitoad. If Torterra really wanted to it could even run a Life Orb, a Naive Nature, and Hidden Power Ice over Stone Edge to get past Tangela after while still being able to go through Drifblim, Altaria, and Braviary after Stealth Rock. Shell Smash Torterra would be similar to how Gorebyss was in the beginning of BW, a dominating force without a sheer of a doubt. About Trick Golurk, I don't think it would be too huge but could be beneficial for teammates. The only move it can really play around with would have to be Drain Punch as it needs Ice Punch to hit Tangela, Braviary, and Shell Smash Torterra. Against switch ins such as Alomomola, CB Golurk is already capable of 2HKOing with Stealth Rock, and even more likely with Spikes. Alomomola generally plays in a way where it switches in and tanks a hit, Wish, and passes immediately after so while Band would be crippling it's still isn't the absolute worst for Alomomola. Tricking Tangela your Choice Band also doesn't really do too much in terms of it against Golurk, as your Ice Punch without CB is doing the same amount to an Evio-less Tangela as CB Ice Punch would do to an Evio one. However, removing Tangela's item and locking into a move makes for a nice opportunity to Shell Smash with Torterra. Golurk also makes a fine Tangela lure so doing so Tricking it shouldn't be too hard.