Kommo O

Kommo-o has a unique role in DOU thanks to its signature Z-Move, Clangorous Soulblaze. While there are other Pokemon that use setup moves in order to win games, such as Dragon Dance Zygarde, Kommo-o is unique in that it actually increases pressure and gains momentum when it sets up, as opposed to losing momentum while taking a turn to use Dragon Dance, thanks to Clangorous Soulblaze's large damage output. On top of this, Kommo-o's access to a very strong STAB spread move and a wide variety of coverage options gives it ample ways to finish games after successfully boosting. The DOU meta is not especially kind to Kommo-o, however, as it is dominated by the Fairy-type Island Guardians. Tapu Fini in particular isn't very good for Kommo-o due to the effect of Misty Terrain weakening Dragon-type moves. Kommo-o is also totally reliant on successfully using Clangorous Soulblaze to be viable, so without boosting, it is at the mercy of almost every powerful threat. Because of this, Kommo-o often requires well-placed support in order for it to function effectively. As Kommo-o is reliant on its Z-Move, any opposing player will automatically be able to identify a Kommo-o team's win condition and will be able to adjust their plays accordingly.