Toucannon

A high Attack stat, a powerful STAB move in Brave Bird, and solid coverage moves such as Bullet Seed, Knock Off, and Brick Break allow Toucannon to break through various walls in the ZU metagame. It also has a pretty passable Special Attack stat, allowing it to use moves like Overheat. With access to Bullet Seed in particular, it can break through Golem, which many other attackers in the tier struggle to do. However, its base 60 Speed tier isn't the best to have and leaves it outsped by a lot of Pokemon, such as Electivire, Floatzel, and Zebstrika. In particular, most Volt Switch users outspeed Toucannon and can easily force it out. It's pretty frail as well, and with its Stealth Rock weakness and reliance on recoil moves, it can get worn down quite quickly. Lastly, it faces competition with Pokemon such as Choice Band Komala and Electivire as a wallbreaker, the former due to its much greater bulk and immunity to status and the latter for its great ability in Motor Drive, significantly better coverage, and much better Speed.