It's ya boi Guzma, the leader of Team Skull of Alola. Now, to start things off, Guzma has a very good character design, and is honestly the thing about Guzma I love the most, just how he looks, alongside how he acts in the games with the ya boi Guzma phrase especially. As far as teams go, Guzma can be a tough battler even with him rocking a bug monotype team, which his teams vary a little between Sun/Moon and Ultra Sun/Ultra Moon, so I'll talk about his Sun & Moon teams first. The first couple of Guzma battles has him using team of Golisopod & Ariados, third battle he uses Golisopod, Ariados, Masquerain & Pinsir, and the final battle he uses team of Golispod, Ariados, Masquerain, Pinsir & Scizor (which I think that fourth battle might be post game?) So generally, his Sun & Moon teams aren't bad, but I like his Ultra Sun & Ultra Moon teams a bit better. In those games, the first battle has Guzma using Golisopod & Masquerain, second battle he rocks up with Golispod, Masquerain & Pinsir, and the third and final battle he'll use team of Golisopod, Masquerain, Pinsir & Vikavolt. Guzma also makes a couple other appearances, once in the rainbow rocket post game where you and Guzma battle alongside each other against a couple rainbow rocket grunts, and then again for the title defense battle once you're champion of Alola, as well as the Battle Tree in Moon & Ultra Moon. Overall, Guzma is a great character and villain, just with the others left, I really had no choice but to take Guzma out for sixth, that's how great the other leaders are.
Ranks:
13th: Piers
12th: Chairman Rose
11th: Archer
10th: Lysandre
9th: N
8th: Colress
7th: Archie
6th: Guzma
Leaders Left:
Giovanni
Maxie
Cyrus
Ghetsis
Lusamine