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


Crasher Wake Sharpedo
Lv. 61
Floatzel
Lv. 63
Quagsire
Lv. 63
Gyarados
Lv. 66
Ludicolo
Lv. 65


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


Byron Skarmory
Lv. 61
Magnezone
Lv. 62
Steelix
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


Cheryl Wobbuffet
Lv. 61
Hariyama
Lv. 62
Wailord
Lv. 63
Drifblim
Lv. 61
Blissey
Lv. 65


Buck Shuckle
Lv. 61
Dusknoir
Lv. 63
Torkoal
Lv. 61
Umbreon
Lv. 63
Claydol
Lv. 65


Marley Ninjask
Lv. 61
Electrode
Lv. 61
Crobat
Lv. 62
Weavile
Lv. 63
Arcanine
Lv. 65


Riley Absol
Lv. 61
Salamence
Lv. 63
Metagross
Lv. 62
Ursaring
Lv. 61
Lucario
Lv. 65


Mira Porygon-Z
Lv. 61
Magnezone
Lv. 62
Gengar
Lv. 61
Togekiss
Lv. 63
Alakazam
Lv. 65