The Sky

The Sky is a transition map between regions. To access The Sky, a Pokémon must know the move Fly, either from leveling with certain Pokémon, like Salamance, or getting the HM from Mt. Skylift. Fly spots outside of The Sky are marked with golden sparkles on the ground. If the move Fly can be used on it, the message "A strong updraft can be felt from here..." will display.

Exbel
Exbel's drop off spot in The Sky is near the center of the map. To access The Sky through Exbel, its fly spot is on the hill on the northeast part of Grassroot Town.

Winden
Winden's drop off spot in The Sky is north of the map. To access the sky through Winden, its fly spot is on the hill north of Snowbasin Town.

Tanren
Tanren's drop off spot in The Sky is east of the map. To access the sky through Tanren, its fly spot is on the hill northeast of Tanren City Plaza.

Archford
Archford's drop off spot in The Sky is south of the map. To access the sky through Archford, its fly spot is on the hill north of Greenport Town.

Trivia

 * The sky was added after the release of Mt. Skylift.
 * In August 2015, The Sky was revamped.
 * The map used to loop around, meaning you could literally go around the world by traveling The Sky. This was removed later.