Two of the islands of the three island kingdom. Third island kingdom Crown Reef is still WIP. Now for a few facts about Pangororia and Turtlereef. And yes they are mainly Pokemon Mystery Dungeon setting.

Pangororia
Xiang Estate is home to Juan's family. Xiang clan is quite big their. Their family home and brewery are on the estate. And they host one of Royal Guard Officer Academy on their Estate as well. Juan's uncle Admiral Kuro Xiang the Urshifu is the current head of Xiang clan. While Juan's dad Kang Xiang the pangoro is the chief of Xiang's brewery. Admiral Kuro is King hawk's best friend, spar buddy and King's Royal Guard Protect. Like Juan is to Mona.
Sun City is the largest settlement of the kingdom and the capital of both the island and the kingdom as a whole. With the Rainbow Palace in the center of the city and Bell Tower in middle of the palace being the tallest building of the city. Quite a few festivals are held around the palace but the most famous being The Feather Festival and Bake Festival as even Lady Fenyx descend down from top of her Bell Tower to take part in.
Emerald Forest is quite a special mystery dungeon as who you meet at it end of it is random. Could be ether Celebii, Cresselia, or Darkrai. Cresselia and Darkrai met in Emerald Forest will give you a test. Cresselia test your kindness while Darkrai make you face your nightmare. Cresselia reward you with one of her feather the Lunar Wing (which is a good way to get a ton of points in Feather Festive). While Darkrai reward you with a strange Membership Card. And Celebiis, they want play.
New Purr Town former know as Sapphire Village was hit hard by a topical storm but with help by a very rich Kantoain Meowth from Meow City, he lead a rebuilding Protect to make the settlement larger and better then before with gather help from around the kingdom. As well as make his Meow Casino in the town.

Turtlereef
Port Village was the first settlement to form on Turtlereef when Mewtwo and group Pokemon land there from the Grass Continent to escaping from the wars between of the Pokemon Tribes.
Turtle Town is heart of Turtlereef as Great Arena and Champion Palace right by it. Many from around the Pokemon World come to this town first to rest and ready to take part in tough battles of Arena.
Sunny Town is newest settlement on Turtlereef as it was form around Rescue Team HQ that was build for Turtlereef's Rescue Team guild a few decades ago. Current guildmaster of it is Captain Frost the Glaceon.
The Great Arena was made by the first champion of the island Mewtwo and many Tournaments are held here but the most special is the Champion Tournament every 4 years. The current Champion pass defend his or her tittle or a new one crown to rule.
Head Temple is where the new champion crown with the Linking Ritual by monks of the temple. As well a new statue put up to join the old champions. Champions: 1st Mewtwo(His name forget do to the passing of time), 2nd Ike the Charizard, 3rd Ari the Lucario, 4th Alan the Jolteon, 5th Morgana the Alolan Meowth.