Archford

Originated in PMU 6, Archford is a region available in PMU 7, accessible only by using HM Surf from the Exbel Penninsula and beating Crescent Islet near the Southern Outpost Island. Archford has its own dungeons, Pokémon, Housing Center, and town. You can fly to Archford on the lower left of the sky. It is an overgrown plant region with many difficult Pokémon.

Dungeons
Mt. Moon (PMU 6) (PMU 7)

Mysterious Jungle (PMU 6) (PMU 7)

Spark Cave (PMU 6)

Boggy Wastes

Southern Sea

Murky Trench

Etc.

Videos
The original way to get to Archford in PMU 6 is by taking the Ferry from the Winden Docks.