Updated version of this team I previously posted. Played 100+ games on a few alts with this team easily able to compete in 1600. Imade some minor changes to adapt to the meta, but anything above 1700 I have little experience, but you can probably make it work given your playstyle and this team composition.
Hoopa OTR + Life Orb Gren
https://pokepast.es/bef33677a4267bd2
Fixed held item on Giritina