Ok so looking at this from scratch, I decided that i obviously wanted to go alongside a simple rain route. Since there would be no other type of team that they both would have good use on, well at least not that im aware of. Tornadus has prankster so decided to make it a rain setter, being able to provide rain up for pert to show some dominance. Hurricane has perfect accuracy in rain and provides obligatory stab. Focus blast is for exellent coverage and nails steels like ferro and tran in particular, which dont mind eating up hurricanes. Thundurus therian provides an ok electric switchin thanks to volt absorb and has that trollish 101 speed (shoutouts lando i). Which gets the jump on the 100 base speed tier, and thats nice. Went with the double dance set because it would be nice if the team had a wincon that hits hard. It's fine if focus blast is ran on thundy t over nasty plot so that it can nail ferrothorn, but its w/e honestly. Politoed is the ideal rain setter, like honestly a staple for rain lol. Primarily because of drizzle which allows mega pert, torn and ferro to utilize it. Mega pert can clean up lategame due to its solid bulk and how it hits hard under rain, bulky waters are problematic since they can scald burn but hey there is thundy t for that matter, along with ferro who just annoys them and can threaten with power whip. Needed a rocks setter so ferro fit the bill. General electric resist, checks some mons like gengar, zam, mega, azu, latis gardevoir and such. Basically its a good mon on rain teams as for the utility it provides. Now of course, rain needs a solid keld check, and since im using torn +thundy a defogger too. First thing that came to mind was latias. Being able to check keld is beneficial to the team overall. It can provide hazard control via defog, healing wish to mega pert so it can clean up, drop a few draco's and psyshock. While packing quite a punch. Not quite to sure if we had to build with both but its too late now, and if it isnt required then you could run like kingdra >thundy or torn.