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In the leftmost room, the player can find Colress, who's talking to himself about Z-Moves and doesn't notice their presence.
In the first room left of the elevator is a man who collects rare Z-Crystals. He will share some of them with the player if they show him a Pokémon capable of using the corresponding Z-Crystal.
In the first room right of the elevator, a Lass is seen together with a Bellossom and a Comfey. Upon realizing the player's presence, the Lass has her Bellossom force them out of the room, leaving an Oran Berry in their hand while doing so. If the player then re-enters the room, the Lass and her Pokémon are gone.
In the rightmost room is an old man, who asks the player to bring together his three old friends from around Heahea City. One of them is an old woman at Heahea Beach, the second is a Gentleman found in the apparel shop, and the third one is a young-looking woman at the harbor, who's later revealed to have used a special Mareanie treatment to make herself look younger. After all three friends have been found, the old man will thank the player by giving them a Revival Herb and reveals that his old house was torn down to make room for the Heahea Pokémon Center.
When the player first visits Heahea City, Lillie can be found temporarily staying at the Tide Song Hotel lobby. During the post-game, while player is challenging the Eevee users, the Flareon User can be found here.