The Hoenn Region hasn't changed at all since Magma and Aqua were defeated and Rayquaza came from space. However, it seems a certain team is eager to bring the ancients to life once again and even bring forth more of the sleeping giants.

Gym Leader
Roxanne
Roggenrola
Minior
Carbink
Shieldon
Anorith
Nosepass

Brawly
Mienfoo
Falinks
Timburr
Mankey
Machop
Makuhita

Wattson
A-Graveler
Boltund
Togedemaru
Flaafyy
Jolteon
Manectric

Flannery
Ninetales
Coalossal
Camerupt
Houndoom
Magmar
Mega Tortuya - Fire/Steel

Norman
Snorlax
Bibarel
Diggersby
Dubwool
Exploud
Mega Slaking - Normal/Fighting

Winona
Pelipper
Braviary
Swoobat
Togekiss
Tropius
Mega Altaria

Tate & Liz
Gardevoir
Gallade
Meowstic M
Meowstic F
Mega Lunatone - Psychic/Dark
Mega Solrock - Psychic/Fire

Wallace
Ludicolo
Empoleon
Gastrodon
Walrein
Wailord
Mega Milotic - Water/Dragon

Sidney
Scrafty
Shiftry
Zoroark
Sharpedo
Mandibuzz
Mega Absol

Phoebe
Banette
Mismagius
Drifblim
Chandelure
Dusknoir
Mega Sableye

Lars (Glacia's Nephew) - Fairy
Sylveon
Alcremie
Florges
A-Ninetails
Togekiss
Mega Wigglytuff - Fairy

Drake
Altaria
Dragalge
Kingdra
Flygon
Haxorous
Mega Salamance

Steven
Skarmony
Aggron
Scizor
Klinklang
Duraludon
Mega Metagross

New Megas
Mega Flygon - Fighting/Dragon

Mega Snorlax - Normal/Steel

Mega Froslass - Ice/Fairy

New Pokemon
Regigrass - Grass

Regiaqua - Water

Regimagma - Fire