Without the intention of triggering Incineroar fans, I'm planning on trying out an Evolite Torracat due to its improved Speed. Yes, Incineroar is still more bulkier, but that's not the point. I personally love Torracat's design (and I also like Incineroar, I promise) and I just want to see if this could work in the Battle Tree.
Nyah Dancer Nyah
Torracat@Evolite
Ability: Blaze (Release Intimidate damn it)
EVs: 252 Att/252 Spe/4 HP
Jolly Nature
Flare Blitz/Swords Dance/Leech Life/Crunch
The idea is to set up Swords Dance and sweep late game. Flare Blitz is Torracat's hardest hitting attack, and should always be used over every other Fire-Type attack. Flame Charge is the only option I would suggest but you'd want to go Adamant then and monkey with the EVs for a more defensive setup for additional survivability.
Leech Life is a magnificent boon for Litten's line, as it functions as a powerful physical recovery attack that can heal Torracat's HP while dealing damage. After SD, it will deal more damage, which means it will heal more health.
Crunch is the final attack. This hits Ghosts for super effective damage, and also hits Pokémon who resist Fire, such as Rock and Water. This is an Egg Move you can get by breeding the Litten line with the Growlithe line that has Crunch. You could also run Outrage, but bewear of Fairy-Type Pokémon and other Pokémon who resist it.