This was one of the first teams I made with SM's release, and I've continued to edit it since. The team focuses on a defensive core of gastrodon/celesteela/rotom-h, with all of these working as great switchins for each other. The gastrodon set and spread is something I stole from Deoxys Speed lol's gen 6 RMT, no idea what it does but it works pretty well. Gastro likes protect much more than scald, since it hits most scald targets with icy wind anyway. For rotom-h, I decided to forego protect and go with double status, which works much better than I expected at first. I've also gone with volt switch>tbolt, to have rotom-h take a hit and give a very free switch-in to ttar/lele. Gastrodon/celesteela end up having major issues against sun, so I decided to add tyranitar here. Tyranitar resets opposing weather, contributes very reliable chip sandstorm damage (with most of my pokemon immune to it), and provides amazing pressure with rock slide and pursuit. As the team was generally slow and bulky so far, the last two pokemon added were Mega Salamence and Tapu Lele. I usually don't evolve mega salamence for most of the match, and it works as an intimidate pivot, while lele helps check fast mons like shaymin sky, mega gengar, and scarf lando that can break through the team's defensive core. The main goal of the team is to either try to weather the opposing team down enough for salamence and tapu lele to clean up in the end, or to pursuit-trap pokemon that beat celesteela with banded tyranitar and stall out the match with celesteela.
I haven't really been saving replays lately, but here are two that should show how the team works in general:
http://replay.pokemonshowdown.com/gen7pokebankdoublesou-494540943 (vs TSR for the ORAS kick-off tournament, rotom-h cripples stuff for celesteela to stall and win)
http://replay.pokemonshowdown.com/gen7pokebankdoublesou-496069339 (vs BlueSkiddoWeCanToo, just demonstrating that ttar actually does good damage and that it isn't hard to find an opportunity to switch it in)