Porygon2

It's easy to brush off Porygon2 as a useless pre-evolution, but thanks to Eviolite, Porygon2 is a Battle Spot Singles super star! Eviolite gives Porygon2 an incredible amount of bulk, which, when combined with Porygon2's sole weakness to Fighting, makes it a very versatile Pokemon. Porygon's checking prowess is nearly unmatched, allowing Porygon2 to take on fearsome threats such as Greninja, Mega Salamence, and Aegislash. With Download and Analytic, Porygon2 takes the opposite role and becomes a surprisingly strong special attacker that surprises its offensive checks. Porygon2 is even the premier Trick Room user of Battle Spot Singles, allowing fearsome threats such as Mega Mawile to run rampant!

This awesome versatility comes at a cost though: Porygon2's uncanny ability to glue teams together makes it an extremely high-value target. Many teams will run problematic Pokemon for Porygon2 together, such as Blaziken and Mega Gengar, specifically to try to overload Porygon2. Also, although Porygon2 is only weak to Fighting-type attacks, it has no resistances and only a Ghost immunity, meaning that strong, boosted neutral attacks can still do a lot of damage to Porygon2. Porygon2's wonderful Eviolite can also be its undoing, as Trick and Knock Off can get rid of it, crippling Porygon2's bulk. While these are important flaws to address, they don't change the fact that Porygon2 is an incredibly easy Pokemon to fit on most teams. If your team is in desperate need of a defensive check to Battle Spot Singles's top threats, or you are in need of a bulky offensive Pokemon, Porygon2 should always be highly considered.