Is this guy seriously using Salamence on a defensive team?
Yes. In fact, almost all CAP stall teams are nearly required to use a Dragon-type Pokemon, or they tend to have a severe Pyroak weakness. With its Fire- and Grass-type coverage, Pyroak hits the staple Ground-, Steel-, Water-, and Grass-types of OU stall teams for super effective damage, and has the power to OHKO most of them. That’s why, in CAP, Salamence’s previously untapped defensive prowess becomes an invaluable resource. With Wish, Roost, Roar, and good type coverage with a single attack, either Latias or Salamence, or occasionally Cyclohm, have important niches on defensive teams.