Hollow Pokemone

Hollow Pokemone is a world that has been confirmed to appear in each game. It is bigger than the other worlds. Darkness Castle was disconnected from this world in Dark Storm 2

Dark Storm
Stephen arrives on the world after Sunset Island, Godzilla, Club Penguin, and a few other worlds are sealed. He sees that Matthew, an old friend of his, is now with the Darkness and is fighting Meta Knight. Meta Knight says to Matthew, "You are strong at body, yes, but you will always be weak at soul!" Hearing this, Matthew unleashes a powerful slash that knocks Meta Knight back to the edge of the world. Stephen fights Matthew in an unbeatable boss fight! After Stephen is knocked out, Matthew takes Stephen's sword and tells Stephen's old teammates to follow HIM, not Stephen. After Matthew leaves, Meta Knight helps Stephen up and tells him about the sewer system. Stephen and Meta Knight jump into the hollow after solving many puzzles. They open door after door until they are below the Main Hallway. If the player hasnt completed Toontown, the VP fights Meta Knight and is defeated. Stephen and Meta Knight open a manhole, and then find themselves in the hallway. Matthew says that Stephen's sword is too dull and throws it in fustration. Stephen then has his sword back, and challenges Matthew to a rematch. This time, Stephen wins. Matthew is swallowed by the darkness in his mind and body, and Meta Knight remarks on what he said earlier was true, that Matthew's soul was too weak. Stephen then talks with his friends/party members, and finds out that the core of Hollow Pokemone will weaken the Darkness. Stephen finds the Core Chamber, but fights Bowser. After Stephen wins, Bowser flees from the castle into the sewer system. But Bowser sets down a Bob-Omb, which causes the Core Chamber to collapse! Stephen and his teammates flee, and Topper remarks on how they'll have to come back later.

Stephen revisits this world after talking to Mr. Grumpy in Philadelphia. Stephen climbs to the Core Chamber Ruins, where the core is still standing despite the Bob-Omb explosion. The Core is sealed, and Black Earth is no longer invisible, allowing Stephen to visit it.

Dark Storm 2
Hollow Pokemone is the game's hub.

Trivia

 * This world has the longest story of any world in Dark Storm.
 * It is unknown why Meta Knight is on Hollow Pokemone in the first place, probably because Dreamland was taken over by Darkness.
 * The Koopalings can be fought here in DS1 after the core is sealed
 * The Core is not golden-yellow, but is instead black with a blue X in the middle