Delphox

Delphox is a great offensive Pokemon in RU; in fact, the fiery fox can hold its own against most playstyles, from full-out stall to hyper offense. Its Fire / Psychic typing grants it a decent STAB combination that hits Pokemon such as Bronzong, Escavalier, Hitmonlee, Registeel, and Poliwrath for super effective damage and helps it add a good amount of defensive synergy for an offensive Pokemon, resisting Grass-, Fighting-, Fairy-, Fire-, and Psychic-types. This is further complemented by Delphox's nice movepool, with gems such as Dazzling Gleam, Grass Knot, Calm Mind, and Trick in addition to its STAB moves.

Sadly, although its 104 base Speed allows it to outrun many relevant Pokemon, such as Hitmonlee, Flygon, Mega Glalie, Hoopa, Qwilfish, and Sigilyph, it falls tantalizingly short of many other faster attackers, including Virizion and Aerodactyl. For all its resistances, Delphox doesn't have very good bulk and is easily worn down by entry hazards and status moves, notably taking 25% damage from Stealth Rock. Due to its secondary Psychic typing, it struggles against the common Sucker Punch and Knock Off, as well as Pursuit users, which give the Choice Scarf set a heck of a hard time. Houndoom is also a huge blockade for Delphox because it's immune to both of Delphox's STAB moves. Though it does compete for a teamslot with other Fire- and Psychic-types, including Houndoom, Delphox possesses keen versatility and a knack for breaking down defensive cores, which makes it a great pick in RU.