After you have completed Stark Mountain's subquest, and whatched as Handsome took Pluto into custody and Team Galactic's final strike fail. You get access to a restaurant within the Survival Area. In this Restaurant, Gym Leaders will show up and will be eager to battle you again. Below are the Gym Leaders and their Pokémon

Roark Aerodactyl
Lv. 62
Probopass
Lv. 61
Rampardos
Lv. 63
Golem
Lv. 61
Tyranitar
Lv. 65


Gardenia Jumpluff
Lv. 61
Cherrim
Lv. 62
Bellossom
Lv. 61
Torterra
Lv. 63
Roserade
Lv. 65


Maylene Hitmontop
Lv. 62
Breloom
Lv. 62
Medicham
Lv. 63
Lucario
Lv. 66
Machamp
Lv. 64


Fantina Banette
Lv. 62
Mismagius
Lv. 62
Gengar
Lv. 63
Driblim
Lv. 66
Dusknoir
Lv. 62


Byron Skarmory
Lv. 61
Magnezone
Lv. 62
Mamoswine
Lv. 61
Bastiodon
Lv. 63
Aggron
Lv. 65


Candice Weavile
Lv. 62
Abomasnow
Lv. 61
Mamoswine
Lv. 61
Froslass
Lv. 63
Glaceon
Lv. 65


Volkner Jolteon
Lv. 61
Raichu
Lv. 61
Luxray
Lv. 62
Electivire
Lv. 65
Lanturn
Lv. 63