Diancie

Diancie's prowess in DOU is very heavily predicated on the immense strength of Diamond Storm. The option to dish out big chunks of damage while also boosting Defense makes Diancie very hard to break once the ball starts rolling. In its base forme, Diancie is one of the tier's best offensive Trick Room setters thanks to its impressive bulk and consistent damage output. Additionally, its phenomenal ability Clear Body means that teams that rely on Intimidate users to check Rock-types will greatly struggle to contain Diancie's damage output. The biggest weakness Diancie faces is its vulnerability outside of Trick Room; Diancie typically has enough bulk to stomach one big hit but rarely two, so pinning it down when it does not hold the Speed advantage can spell doom for it. Mega Diancie struggles to find a niche due to its frailty, but it can still punch holes in unsuspecting teams in favorable positions. While Diancie can be reduced to a Diamond Storm bot at times, the flexibility it can provide to a large swath of team archetypes solely because it can both set and take advantage of Trick Room should not be underestimated.