Sorry if the description seems rushed, I was pressed for time. I decided to build around reuniclus since with CM coupled with magic guard, it has the ability to beat just about every balance build out there, especially with gastro torn balances skyrocketing in usage. I paired it with sd mega scizor because of its ability to beat offense the majority of the time due to its sheer bulk and powerful priority bullet punch. These two have the ability to beat each others checks, like reuni beating pex, celesteela, gastrodon, etc. while scizor beats offensive pokemon that overwhelm reuniclus (notably tyranitar and weavile). Choice scarf landorus along with clef checks just about every physical attacker in the tier, notably medicham and zygarde. Torn gives an answer to kartana and tapu bulu along with defog support and luring in the likes of ferrothorn with heat wave. Knock off or uturn is an option in the last slot, with uturn being preferred simply by providing momentum (focus blast and superpower also work over heat wave but not preferred to being low accuracy and weak without atk investment). Finally, gastrodon is a premier answer to water types like greninja, keldeo, and kingdra, as well as the ever prevalent tapu koko; this mon rounds out the defensive core well.

Threatlist: Heatran is a potential threat if gastrodon is weakened, however clef lures it in and bops it with a twave to cripple.
SD Mega Scizor: not really a threat at all since your own scizor walls it due to the defense investment, and it gets beat 1v1 since clef twaves it on the switch.
Tapu Lele: also not too much of a threat, just need to play around focus blast + hp fire (which both arent ran too much anymore on the same set, also every team in theory loses to lele that doesnt have a jirachi, but its just easily played around)

Anyways, sorry this wasnt very refined, but the team has put in a ton of work and I plan to use it in upcoming tournaments just because its so solid.