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Thundurus can survive basically any special attack with its assault vest, even super effective hits like blizzard from iron bundle.
it can bring an ursaluna to the red with grass knot or snarl for longevity and support.

A strong focus of the team is to keep thundurus on the field by healing it, iron moth can keep it healthy with discharge and support it with acid spray or clean up with energy ball and heat wave. Should live earth powers from heatran if thundurus snarls it

This is an offensive grimmsnarl with life orb, designed to KO fluttermane. 252 adamant sucker punch should OHKO 80+% of the time, and it can dark tera to help guarantee the KO. You can also pick up the assist Ko using regieleki. Grimmsnarl can also heal thundurus with thunder wave