Blaziken

After a boost from Speed Boost, Blaziken boasts extremely impressive matchups against common Pokemon, being able to outspeed and OHKO around 2/3 of the top 20 Pokemon in the DOU metagame and deal massive damage to most others. However, Blaziken is awkward to use because its best STAB options, Overheat and Superpower, force it to switch, which meshes poorly with Speed Boost. It ends up being played as a hit-and-run attacker that has to stay on the field for a turn before it can hit, sacrificing momentum. In addition, it's nearly useless in the face of speed control. Blaziken also faces direct competition from Talonflame and Infernape, strong Fire-types that are able to attack immediately thanks to their high base Speeds. Additionally, Talonflame boasts extremely strong priority and Infernape has access to Fake Out and Close Combat. However, nothing else in DOU can match Blaziken's spectacular 1v1 matchups.