Durant
Tier B
Availability: Mid-late
Movepool: Good.
I'll start with the bad. Durant has the special defense stat of a wet noodle, and hustle makes him unreliable sometimes. Ok, now on to the good. This thing is pretty fast and hits like a freight train. Bug steel is a pretty good typing that can somewhat offset his special weakness. One of his big draws (for me at least) is that he destroys some of the big threats on the later gym leaders; Noel's Clefable and Radomus's gardevoir, along with most of Luna's team. His movepool includes some strong options such as Iron head, x-scissor, dig, crunch, and rock slide. Durant is high risk, high reward. Players with anger management issues should not use Durant, otherwise they just might punch a hole in their computer screen when he misses an X--scissor or iron head.
Darmanitan
Tier B or A
Availability: mid-late
Movepool: Good.
Words don't even describe how strong this thing is. I don't know what they were smoking at game freak when they decided to give it 140 base attack and sheer force. You don't even have to use flare blitz if you don't like the recoil damage. Fire punch with the sheer force boost still hits amazingly hard. For coverage Darmanitan gets access to strong fighting moves like Superpower, Hammer Arm, and brick break. For even more overwhelming power, if you get the opportunity you can set up a belly drum to end all life in the reborn region. While darmanitan has pretty bad defenses, he has pretty good hp and speed so he can usually live long enough to annihilate something.