These two pack a great deal of power between them and form a good pair. Since Kyurem-B is susceptible to all forms of hazards, offensive Starmie is a naturally good partner for its ability to pressure common hazard setters and remove hazards in a pinch with its high speed. With HP Fire, Starmie further aids Kyurem-B by luring Ferrothorn and giving the dragon much more free reign. This also lessen the need for Kyurem-B to run HP Fire itself, freeing room for other options. Starmie's ability to check Pokemon like Keldeo for Kyurem-B is also appreciated.
Kyurem-B aids Starmie with "hazard control" by pressuring the majority of OU's common setters. Hippowdon, Garchomp, Heatran, and Landorus-T are all threatened heavily by Kyurem-B. By placing enough pressure on these Pokemon through aggressive play, they can potentially be prevented from laying down SR. Should Kyurem-B successfully pressure these Pokemon into not laying down SR, Starmie doesn't have to waste a turn spinning and can use the time to fire some powerful Analytic boosted attacks instead. In this way, Starmie benefits greatly from Kyurem-B's impressive offensive presence. This aside, Kyurem-B helps Starmie by dealing with the likes of Mega Manectric and Rotom-W. Its ability to pressure things like Slowbro and Celebi is also appreciated, especially with Starmie's lack of Ice Beam and Thunderbolt.
Overall, Starmie and Kyurem-B love each other's company. Aside from covering each other's issues, the immense offensive between these two places a good deal of pressure on the majority of hazard setters. This helps greatly with controlling the hazard game and demonstrates how two Pokemon can work together to satisfy the theme for this week.