XY Hatch Locations, courtesy of Esmeya:

Towns

Vaniville Town
Aquacorde Town
Santalune City
Lumoise City
Camphier Town
Cyllage City
Ambrette Town
Geosenge Town
Shalour City
Coumarine City
Laverre City
Dendemille Town
Anistar City
Couriway Town
Snowbelle City
Pokemon League
Kiloude City
Buildings
Lumoise Station
Kiloude Station
Battle Chateau
Parfum Palace
Shabboneau Castle
Battle Maison
Ambrette Aquarium
Prism Tower
Tower of Mastery
Lost Hotel
Pokeball Factory
Kalos Power Plant


Routes

Route 1
Route 2
Route 3
Route 4
Route 5
Route 6
Route 7
Route 8
Route 9
Route 10
Route 11
Route 12
Route 13
Route 14
Route 15
Route 16
Route 17
Route 18
Route 19
Route 20
Route 21
Route 22


Caves

Connecting Cave
Glittering Cave
Reflecting Cave
Sea Spirit’s Den
Frost Cavern
Terminus Cave
Chamber of Emptiness
Victory Road
Unknown Dungeon [Area with Mewtwo]


Gates

Lumoise Gate
Ambrette Gate
Shalour Gate
Laverre Gate
Dendemille Gate
Anistar Gate
Couriway Gate
Snowbelle Gate
Pokemon League Gate


Misc

Azure Bay
Pokemon Village
Santalune Forest
Friend Safari
Blazing Chamber [Elite Four]
Ironworks Chamber [Elite Four]
Dragonmark Chamber [Elite Four]
Flood Chamber [Elite Four]
Radiant Chamber [Elite Four]

Team Flare Secret HQ (Available for short time during story)
Team Flare Hideout (Available for short time during story)