The Dealer of Destruction!

After much planning, Professor Kukui has finally announced the formation of a Pokémon League in Alola. However, while the rest of Alola (including Team Rocket) celebrates and gets ready, Team Skull's leader Guzma is enraged and decides that he will destroy the new Pokémon League, and heads over to the Pokémon School to confront Kukui. Before things can get ugly, Ash challenges Guzma to a battle. It's Pikachu vs. Guzma's Golisopod; who will win, and why does Guzma hate Kukui so much?