yo, KaiserKaiba here to revive a dead thread. I will post stuff I use recently and that have enough balance between viability and originality/fun (even if it is not my best teams as most of them are used seriously by friends and all).
An offense around the core of Lopunny-Mega and Victini but with a little twist: A set of Final Gambit Victini without Choice Scarf. I really like this set as you can easily bait the scarf as long you dont take damage (or you can change the leftovers for the flame plate or any random berries you want) and, thus, reduce greatly the votality of Final Gambit on target such as Toxapex, Latias-Mega or Heatran. Finally, you can run many great support options such as Will-O-Wisp. For the rest of the team, Magearna Assault Vest, Toxapex and a Normal Gem Landorus-Therian Explosion (really efficient to bait Bulky Flyer for Lopunny-Mega) form the devensive backbone and an Offensive Z-Hurricane Tornadus-Therian with Defog conclude this team (with Sludge Bomb to catch Tapu Koko and poison bulky pokemon such as Sableye-Mega). Good team but be aware that, like every Lopunny Offense builds, the team almost auto-lose against any stall.

S/O
Proftreez because I only helped him on this team lol
Not sure how to explain this one as I kind of forget what was the idea behind this squad lol. Anyway, the team features the core of SpeDef Excadrill, Alakazam-Mega and Z-Hydro Pump Greninja-Ash. Not only Alakazam-Mega will appreciate the helps from Spikes and Stealth Rock, Excadrill is a great partner as it can abuse many Alakazam's checks (such as Magearna and Chansey) and Tapu Koko for Greninja-Ash. Moreover, to abuse even more hazards supports, Alakazam-Mega holds Taunt, forcing switchs against do-nothing pokemons. Tapu Fini and Zapdos, alongside Excadrill, form a solid defensive core and, to conclude the team, a set of Choice Band Scizor was chosen: a powerful offensive pivot with many good assets such as Knock Off to melt Heatran or Celesteela, Pursuit to trap Latias-Mega, Speed Control with Bullet Punch and another "frail" psy-resist.
I take a liking to Charizard-Mega-X on more fattish structure. Here, the team is around the core of Charizard-Mega-X, Excadrill and Slowbro. The idea is rather simple as Charizard is able to freely switch on complicate steel such as Scizor-Mega or Celesteela for Excadrill while this latter will provide Rapid Spin. Slowbro, not only being a good overall physical sponge and pairs well with the natural dual-typing of Charizard, is able to remove Toxapex with the Psychium Z on Future Sight for Charizard again. For the rest, Magearna and Tornadus-Therian will both feature a fight-move to lure Heatran; finally, Kommo-o was chosen to close the defensive backbone of the team while providing the unusual (on Spedef variant I mean) Poison Jab to lure Tapu Fini.

S/O
Proftreez for the huge help on this team
Another balance with the heat pick of Breloom. With the combination of Poison Heal, Swords Dance, Facade, Spore and a decent dual-type; Breloom, like the infamous bad Gliscor, is able to become a wincondition with good Staying Power. With those advantages, Diancie-Mega is an excellent partner as Breloom is able to abuse its natural checks such as Chansey, Ferrothorn and Gastrodon; while Diancie-Mega will abuse Flyers for Breloom. Moreover, Zapdos, not only it covers nicely the natural weakness that both of them have such as Gliscor or Scizor-Mega, with its ability (alongside Jirachi with Body Slam) provide a way to spread paralysis and, naturally, slowing down the opposing team to capitalyze even more on Breloom. Finally, Tornadus-Therian and Gastrodon were picked to form a nice defensive core with Jirachi.
Last team of this post with a pokemon which, in my opinion, has a real potential in this metagame: Noivern. With an outstanding speed, a great dual-type and the broken Super Fang, Noivern is unmatched in term of progressing for an offensive pivot. Thus, I believe that Noivern is an excellent pair for any dummy breaker such as Kartana, Tapu Lele or Tapu Koko as Super Fang, by itself, can easily chip anything and shut-down any form of recovery with Taunt (therefore, I recommend a breaker with a natural good Match-Up against rege-core); here, we picked Kartana Choice Band. Alongside Noivern and Kartana, Lopunny-Mega will serve as our cleaner once the team was weaken enough. Finally, Landorus-Therian Choice Scarf, Heatran and Tapu Fini (by the way, Bold with Aguav Berry is a crazy set to soft-check a bunch of stuff) will give us enough defensive support.
Hope you will like the teams and sorry in advance for the spelling mistakes.