Gothitelle

Gothitelle is one of the most dangerous Trick Room setters you can face in VGC 2018 thanks to its above-average bulk and access to the very intimidating Shadow Tag.

Shadow Tag allows Gothitelle to not only set up Trick Room but also become one half of the well-known Perish Trap combination alongside Mega Gengar.

Gothitelle synergizes well with some of the top Trick Room attackers in the game like Mega Mawile, Azumarill, and Snorlax.

A decent movepool gives Gothitelle access to support moves such as Heal Pulse, Taunt, Tickle, Skill Swap, Recycle, and Ally Switch.

Its Psychic typing leaves Gothitelle weak to Ghost-, Dark-, and Bug-type attacks. While Gothitelle's bulk is above average, it isn't enough to survive some of the bigger hits Trick Room setters like Cresselia and Porygon2 can take.

Gothitelle typically only run one attacking move, which leaves it extremely weak to Taunt and being ignored. Gothitelle will not do much damage to Pokemon that aren't weak to Psychic-type attacks.