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 26: Lucca's Orphanage - Chrono Cross Guide - IGN

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

Part 06: Viper Manor (Another) - Chrono Cross Guide - IGN

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

Part 16: S.S. Zelbess - Chrono Cross Guide - IGN

Part 06: Viper Manor (Another) - Chrono Cross Guide - IGN

Part 25: Chronopolis - Chrono Cross Guide - IGN

Part 25: Chronopolis - Chrono Cross Guide - IGN

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

Part 25: Chronopolis - Chrono Cross Guide - IGN

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

Part 26: Lucca's Orphanage - Chrono Cross Guide - IGN

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

Part 19: Techs and Summons - Chrono Cross Guide - IGN