Champion: Natsu Dragneel

Main Battle Mechanic: Mega Evolution

Team:

Ace: Mega Charizard Y (sorry Mega Charizard X fans)

Incineroar
Tyranitar
Lopunny
Staraptor
Alolan Sandslash

Elite Four Members: Note: this will take the order you'll be challenging them

Elite Four Member 1: Gray Fullbuster

Type Specialty: Ice

Main Mechanic: Terrastallization

Team:

Ace: Feraligatr (Tera Ice)

Walrein
Glaceon
Abomasnow
Froslass
Aurorus

Elite four Member 2: Lucy Heartfilia

Type Specialty: Fairy

Main Mechanic: Z-move

Team:

Ace: Primarina (Primarium Z)

Klefki
Gardevoir
Whimsicott
Galarian Rapidash
Grimmsnarl

Elite four Member 3: Erza Scarlet

Type Specialty: Steel

Main Mechanic: Z-Moves

Team:

Ace: Aegislash (Steelium Z)

Steelix
Mawile
Escavalier
Aggron
Corvinight

Elite Four Member 4: Wendy Marvell

Type Specialty: Flying

Main Mechanic: Mega Evolution

Team:

Ace: Mega Altaria

Braviary
Swanna
Swellow
Talonflame
Togekiss