After defeating Monotoli's guard robots, you confront Monotoli himself.
Learn about Summers from Monotoli
Approach Monotoli, then go talk to him. Paula will rejoin you. Talk to Monotoli again and he will say that Giygas seems to want to prevent you from going to Summers. Monotoli wants to help you fight Giygas, so he opens the passage to his helipad. Go through the passage and approach the helicopter. After the cut scene, go back inside and talk to Monotoli again.
Try to leave the room, and Paula will sense that you need to go to Threed.
Go with the Runaway Five to Threed
Leave Monotoli's office. The Runaway Five offer to take you to Threed in their tour bus.
Before you leave the building, you can go around the offices to pick up any items that you might have missed. The Sentry Robots are gone.
When you are ready, go outside. Apple Kid will call you before you leave. When you are outside, approach the front of the tour bus to get in.
When the band drops you off in Threed, Gorgeous says maybe you left some sort of gadget here.
Find Transportation to Summers
Go to the graveyard in the north, where the Sky Runner crashed. Climb down the ladder and go into the cave at the end. Some people have tried to repair the Sky Runner. Check on the Sky Runner. Jeff is able complete the repairs, but the Sky Runner is only able to go to Winters.
Fight Shrooom! while you Wait
When you arrive in the lab, the monkeys talk to you and mention the cave to the north.
Talk to Dr. Andonuts. He will agree to reprogram the Sky Runner to send you to Summers. While you wait, go into the cave north of Stonehenge.
Talk to the sparkle to battle Shrooom!. It is weak to Fire. It can scatter spores to cause mushroomization and poisoning. If anyone is mushroomized, you might want to make them Defend so they can't hurt the others. Poison can be healed with Healing β or higher, as well as with certain herbs and other items. Shrooom! doesn't attack with PSI, so Ness can use Shield to protect against Shrooom!'s attacks.
After you defeat Shrooom!, go through the door that it was guarding to reach Rainy Circle and get the Sound Stone Melody.
Afterward, go east through the cave (all of the monsters will run away from you) and use the Pencil Eraser on the pencil statue outside near Brick Road's maze. This will help later. Then you can give the Pencil Eraser to Escargo Express because you'll never need it again.
Fly to Summers
When you are ready, talk to Dr. Andonuts. He says that the Sky Runner is ready. Go into it to fly to Summers.