Champion: Izuku Midoriya

Main Mechanic: Mega Evolution (although he can use all Mechanics)

Team:

Ace: Mega Lucario

Flygon
Kantonian Raichu
Gyarados
Decidueye
Cinderace

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

Elite Four Member 1: Eijiro Kirishima

Type Specialty: Rock

Main Mechanic: Terrastallization

Team:

Ace: Machamp (Tera Rock)

Rampardos
Midnight Lycanroc
Tyrantrum
Sudowoodo
Alolan Golem

Elite four Member 2: Ochaco Uraraka

Type Specialty: Psychic

Main Mechanic: Z-moves

Team:

Ace: Reuniclus (Psychium Z)

Kantonian Mr. Mime
Alolan Raichu
Meowstic (F)
Medicham
Sigilyph

Elite Four Member 3: Shoto Todoroki

Type Specialty: Ice

Main Mechanic: Z-moves

Team:

Ace: Alolan Ninetales (Icium Z)

Galarian Darmanitan
Lapras
Glaceon
Glalie
Aurorus

Elite Four Member 4: Katsuki Bakugo

Type Specialty: Fire

Main Mechanic: Mega Evolution

Ace: Mega Charizard X

Typhlosion
Armarouge
Magmortar
Heat Rotom
Talonflame