Gothitelle

Gothitelle carves itself a niche in the Doubles OU metagame as one of two viable Shadow Tag users, with the other being Mega Gengar. Over its fellow trapper, Gothitelle boasts better defensive stats, the immediate ability to trap, and the ability to be used alongside another Mega Pokemon. Shadow Tag allows Gothitelle to provide excellent setup opportunities for teammates, aided by its wide range of support moves such as Charm, Heal Pulse, and Helping Hand. Gothitelle also fills the role of a bulky Psychic-type Trick Room setter and general supporter, as its great support movepool allows it to assist a variety of teammates.

However, Gothitelle faces competition in these roles from other Psychic-types such as Cresselia, which boasts far better defensive stats and more reliable recovery in Moonlight. Gothitelle's pure Psychic typing and low offensive presence leave it particularly weak to Pokemon that greatly threaten Trick Room teams such as Bisharp, Hoopa-U, Heatran, and Aegislash. Due to this, Gothitelle also faces competition from other Trick Room setters such as Hoopa-U, Jellicent, and Reuniclus, which can all alleviate some of these weaknesses. Gothitelle's poor Special Attack stat and limited coverage leave it especially vulnerable to Taunt.