Part 25: Chronopolis - Chrono Cross Guide - IGN

Once everything is done, go to the Dead Sea Ruins (Home), and interact with one of the three glowing points in the water.

Part 25: Chronopolis - Chrono Cross Guide - IGN

Part 05: Nikki's Path - Chrono Cross Guide - IGN

Part 05: Nikki's Path - Chrono Cross Guide - IGN

Part 25: Chronopolis - Chrono Cross Guide - IGN

Part 09: Hermit's Hideaway - Chrono Cross Guide - IGN

Part 07: Guldove (Another) - Chrono Cross Guide - IGN

Part 20: Viper Manor Revisited - Chrono Cross Guide - IGN

Part 03: Arni Village (Another) - Chrono Cross Guide - IGN

Part 21: Characters & Techs 1 - Chrono Cross Guide - IGN

Chrono Cross Guide - IGN

Part 24: Characters & Techs 2 - Chrono Cross Guide - IGN

Part 10: S.S. Invincible - Chrono Cross Guide - IGN

Part 18: The Dead Sea - Chrono Cross Guide - IGN

Part 05: Nikki's Path - Chrono Cross Guide - IGN