When Phantom leads an assault after the Egg, Manaphy hatches in May's arms, who presumes she is its mother. The group eventually escapes Phantom by running into a network of ruins belonging to the People of the Water, where Ash and his friends learn about Samiya. Walker declines Ash and his friends' further involvement with his mission and departs in a boat with the Marina Group toward Samiya. However, Manaphy shows discomfort and starts crying without May's presence, forcing Ash and his friends along anyway. Manaphy's natural instincts lead the boat toward Samiya, and to Walker's dismay, May and Manaphy bond closer. Walker warns May of Manaphy's destiny to become Samiya's leader and that she will eventually need to part ways with it. May understands, but is distraught nonetheless. Lizabeth, the Marina Group's daughter, comforts May and gives her a bracelet known as the People of the Water's Mark as a memento of her time with Manaphy. One day, May loses her bandanna to the wind and Manaphy embarks far into the ocean to retrieve it. Ash and his friends, board a submarine operated by Lizabeth to search for Manaphy, eventually finding it along with Samiya during the expected lunar eclipse. Unbeknownst to them, Phantom had been in pursuit the whole time.
