Porygon2

Porygon2 establishes itself as the premier Trick Room setter in the VGC 2017 metagame boasting great overall bulk with Eviolite, and offensive capability with Download. Porygon2 gets access to a good amount of offensive coverage, capable of tackling the likes of Garchomp, Araquanid, and Tapu Bulu with Ice Beam and Thunderbolt. Porygon2 also displays great prowess in endgame situations thanks to Recover and Toxic allowing it to poison bulky targets that it usually doesn't hit so well, such as Snorlax, and continually heal. While Porygon2's only weakness is very uncommon in the metagame, Fighting-types like Hariyama, Pheromosa, and Buzzwole can cause it plenty of trouble. Its main drawback comes when fighting against bulkier Steel-types such as Celesteela that can shrug off Toxic and match its defensive capabilities. Its offensive presence is also significantly decreased when Download boosts Attack, making it somewhat less reliable. Additionally, Porygon2 is susceptible to Knock Off from Alolan Muk and Hariyama, making it significantly less bulky.