Elgyem

Although it resists Fighting and has decent bulk, Elgyem has difficulty differentiating itself from Spritzee, an overall better offensive Trick Room user. Possessing a weakness to Knock Off and Sucker Punch is detrimental for Elgyem, especially compared to Spritzee’s resistance to Dark, and having to resort to Hidden Power to hit said Dark-types diminishes Elgyem’s offensive presence. Becoming Pursuit trapped by Pokemon such as Alolan Grimer is also annoying for Elgyem. Even Solosis, although it's not viable either, is better than Elgyem in performing this role due to Magic Guard and a higher Special Attack stat. While Elgyem is a better check to Abra than Spritzee and Analytic is quite a useful ability to for it to have, its ability works against itself under Trick Room, and Elgyem's strengths pale in comparison to the overwhelming number of advantages Spritzee has over it as an offensive Trick Room setter.