Grimmsnarl

Grimmsnarl is the premier dual screens setter in Ubers due to Prankster, Taunt, and STAB Play Rough to hit Dark-types immune to Prankster Taunt, including Yveltal. These qualities almost guarantee that Grimmsnarl will set up screens, helping a wide variety of offensive Pokemon set up. Grimmsnarl's bulk and typing enable it to switch into threats such as Marshadow, Calyrex-S, and Yveltal throughout the game, which gives the offensive teams a more favourable matchup versus these otherwise troublesome threats. However, Grimmsnarl struggles versus Pokemon that can set up against it and threaten a KO simultaneously, for example Xerneas and Necrozma-DM, which force it into a coinflip situation of setting up the appropriate screen or using Taunt. Additionally, teams featuring both Defog Ho-Oh and Yveltal can completely neutralize Grimmsnarl: when Grimmsnarl uses Taunt to stop Ho-Oh's Defog from removing screens, Ho-Oh can go for a Sacred Fire burn, which makes Play Rough so weak that Yveltal can freely come in and shut Grimmsnarl down with Defog.