I`m new here but I`d like to nominate Incineroar.
Unranked -> C or C+
I have had a lot, admittedly low-ladder, success with this Incineroar set:
Incineroar @ Heavy-Duty Boots
Level: 100
Careful Nature
Ability: Intimidate
EVs: 252 HP / 100 Def / 100 SpD / 60 Spe
- Knock Off
- Flare Blitz
-...