From Bulbapedia, the community-driven Pokémon encyclopedia.
Grand Spectrala Islet (Japanese: マホラ小島 Mahora Islet) is the fourth island Ash, Iris and Cilan visited during their travels through the Decolore Islands. It is only accessible from Grand Spectrala Island when the tide is low, since the only bridge connecting the islands is destroyed.
Being mostly covered with a forest, the only building on the island is an abandoned Pokémon Center. Giant Pokémon are said to inhabit here, however, in The Island of Illusions! all of them were proven to be illusions created by a Zoroark in order to protect the other wild Pokémon on the island from poachers.
The formerly abandoned Pokémon Center is recommissioned by its previous Nurse Joy, who was originally sent there to investigate rumors of an illegally operated Pokémon Center. With the help of Ash and his friends, both Nurse Joy and Zoroark were able to clean up and reopen the center to heal the island's wild Pokémon.
Pokémon seen on Grand Spectrala Islet
Created via Illusion