As with every game,:

#1 - Aaron

The first Elite Member is a bug type trainer. Focusing on Bug Type Moves supplemented by some moves to attack the likely targets

Dustox Heracross Vespiquen Beautifly Drapion
Lv. 53 Lv. 54 Lv. 54 Lv. 53 Lv. 57

#2 - Bertha

The second Elite Member is a Ground Type Pokémon enthusiast. With Ground Type Moves mixed in with some other types to topple some of its weaknesses

Quagsire Hippowdon Sudowoodo Whiscash Golem
Lv. 55 Lv. 59 Lv. 57 Lv. 55 Lv. 56

#3 - Flint

The third Elite Member is a Fire Type Pokémon enthusiast. With Fire Type Moves mixed in with some other types to topple some of its weaknesses

Rapidash Infernape Steelix Lopunny Drifblim
Lv. 58 Lv. 61 Lv. 57 Lv. 57 Lv. 58

#4 - Lucian

The final Elite Member is a Psychic Type Pokémon enthusiast. With Psychic Type Moves mixed in with some other types to topple some of its weaknesses

Mr. Mime Girafarig Medicham Alakazam Bronzong
Lv. 59 Lv. 59 Lv. 60 Lv. 60 Lv. 63

#5 - Champion Cynthia

The champion, Cynthia, who helped you with Team Galactic at an earlier time, has a variety of types on her team and will require upmost strategy

Spiritomb Garchomp Gastrodon Milotic Roserade Lucario
Lv. 61 Lv. 66 Lv. 60 Lv. 63 Lv. 60 Lv. 63