Archford

Archford is a region accessible in PMU 7, though one must use HM Surf from the Exbel Penninsula and beat Crescent Islet (the player doesn't need to complete its depths to gain access) near the South Outpost Island first. It is an overgrown plant region with many dungeons and new Pokémon, as well as the typical Housing Center, training dojo, and arena. As it's the last region that can be unlocked, it is considered the hardest of the four available regions. Unlike other regions, Archford has its main town along with two other separate islands. You can fly down to Archford from the lower left area of the sky.

Like the other regions, previously existed in PMU 6.

Dungeons

 * Mt. Moon
 * Mysterious Jungle
 * Boggy Wastes
 * Murky Trench
 * Voltaic Rainforest
 * Inferno Volcano
 * Stark Volcanic Woods
 * Starlit Lagoon
 * Seafloor Ruins
 * Sandy Shallows
 * Lush Archipelago
 * Archipelago Thicket
 * Archford Training Dojo

Underwater
In Archford, using any of the dive spots in its sea will take you to its unique underwater subworld. Wild Water-types accompany it, and you can return back by stepping on any of the landing tiles via first using Dive. Its only purpose as of now is to hold the entrance to Seafloor Ruins.

Trivia

 * In PMU 6, the original way to get to Archford was by taking the ferry from the Winden Docks.
 * The player can find a Delibird NPC that references this in Greenport Town.