Zygarde. Can we discuss this beast?
Notable moves (attacking): earth quake, stone edge, extreme speed, dragon claw
Notable moves (support): substitute, coil, dragon dance, glare
Zygarde is pretty bulky and with substitute can be a set up late game sweeper with e-speed/eq/sub/coil, or an early game wall breaker with eq/stone edge/coil/sub
Or you can run all out attacking DD with e-speed instead of sub, though IMHO I think coil is where it's at. The level of physical bulk it reaches is actually ridiculous.
Very underrated, and you can also run a glare set - somewhat gimmicky but effective especially in its surprise factor.
Zygarde is a versatile and underrated pokemon that makes serious dents in teams through both its set up ability, good attack coverage, usage of e-speed, amazing bulk, and general surprise factor against the meta, which is unprepared for it.
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On thundurus-T, let's not forget that with assault vest it is an amazing pivot that can check/counter ALL bolt/beam attackers, while still affording team momentum. It also has access to knock off, which is amazing for a pivot. C-? Ridiculous. B- minimum.... it's a better wall breaker, has a more useful ability, and can opt for a AV offensive pivot set.