Soliera is introduced when the player first arrives at Ultra Megalopolis, where she and Phyco greet the Alolan. They direct the player to Megalo Tower, where Necrozma can be challenged. After defeating Necrozma, Soliera will gift a Poipole to the player.
Pokémon Ultra Moon
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Soliera and Phyco are encountered throughout the player's journey as they investigate Alola to learn about Z-Crystals. The pair first appear in Iki Town after the player's battle against Hau, but do not formerly introduce themselves until after the first trial in Verdant Cavern.
In Seaward Cave, Soliera battles the player, using a Pokémon caught in Alola, to experience firsthand what a Pokémon battle is like. She later challenges the player again in Paniola Ranch, this time using a more familiar Pokémon, Poipole.
"Welcome, resident of Alola. I am Soliera. I am a member of the Ultra Recon Squad."
"Necrozma returned from Alola. You will find it up ahead. It seems to be resting atop the tower. Our people have all fled indoors to safety. They fear it will fly into another rage, as it did when that woman Lusamine appeared."
"Please. Help us stop Necrozma. You will find it ahead of this place... atop the Megalo Tower."
"So you will truly go?"
"But...our ancestors grew too greedy, and they caused Necrozma to lose a part of its body. And this in turn made Necrozma run wild... Help it if you can. We beg you..."
"It will likely take some time, but eventually we may also be awash in light again. Like you all. My thanks to the people of Alola. My thanks to the light of the Z-Crystals."
"Captain Phyco... I believe that Poipole is showing an interest in this person from Alola. It seems to want to stay together with him/her."
"According to what we have learned through our investigations, I believe that in your world, giving a Pokémon to another can be a way of demonstrating your feelings for them... And besides, Poipole seems to want to go. Take it with you, if you have no objection."
Maybe next time: "I see... Please take Poipole with you at another time."
"The Ultra Recon Squad is— Well, as the name suggests, it is a group that investigates Ultra Wormholes and Ultra Beasts. This is Captain Phyco. And I am Soliera."
"There is a creature...known as Necrozma. It is able to bestow light upon others, but now it runs wild, beyond reason. We call it the Blinding One out of respect, but... I fear that the day may come when Alola loses its light to Necrozma"
"It's thought the power that came pouring out of the Ultra Wormhole at that time may be the source of Z-Moves' power... Yes, the light that the Blinding One... I mean, the light that Necrozma can wield."
"Our world is at peace now thanks to the Megalo Tower, which keeps the Blinding One contained. But we believe the tower is reaching its limit. And the Blinding One... Necrozma hungers for light."
"Captain Phyco, they only seem worried for Cosmog's safety..."
"And they are able to use Z-Moves. The power of the Blinding One."
"I will battle you... I will battle you with our Pokémon. The Ultra Beast Poipole."
Upon being defeated:
"It seems we're still not drawing out the full potential of our Pokémon..."
"We will find a way to deal with Necrozma. You children should pursue your own dreams."
"Don't end up with the same kinds of regrets that we have..."
"Was this all for her own selfish satisfaction? Or does she simply feel too much responsibility to take everything upon herself to fix? What is she thinking? What an incomprehensible individual... Though that is much as we had heard."
"We borrowed such a brute's power ourselves to come here to Alola."
"If Necrozma awakens...it will hunger for light. And it will descend upon Alola to take it."
"Our world... Ultra Megalopolis is a world without any light left in it, after all."
"Necrozma wants to take back the light that it once lost."
"Please, Captain Phyco... Leave it be."
"It is not in our power to fight with Solgaleo. But we do borrow its power to travel through the Ultra Wormholes. You have shown us what you are capable of, though, by summoning Lunala to this place. Perhaps you could ride upon our Solgaleo. Yes... Just as you ride upon Pokémon in Alola!"
"Do you want to use Solgaleo's power to try to reach the white warp hole?"
I'll do that: "Solgaleo! Aid us!"
After defeating Necrozma at Megalo Tower:
"Thank you very much, trial-goer."
"While you faced Necrozma in our Ultra Megalopolis, there are some things we found out about the auras that fill Alola..."
"Before our ancestors were forced to contain it, Necrozma emitted powerful light... That light is what you call auras!"
"Yes... Both the Z-Power for the Z-Moves and the auras of the Totem Pokémon are powers gifted to you by Necrozma."
"As thanks for your help, we will continue to share our Solgaleo with you freely. You should be able to meet many amazing Pokémon by using Ultra Warp Ride to explore different worlds!"
"I...would like to travel Alola as a Trainer, along with my Pokémon partners."
Soliera debuted in PASM27. She was first seen receiving a call from Dulse, who reported that he and Zossie lost the Lunala they were using to traverse through Ultra Space. As they talked, Soliera checked on the condition of Necrozma, who was in pain despite having absorbed Solgaleo to become its Dusk Mane form.
In PASM28, Zossie arrived at the Ultra Megalopolis with Sun and Moon. Shortly after, a Stakataka appeared, looking to battle with Necrozma. Wanting to see if the bonds between Trainers and their Pokémon could lead to a solution that would restore light to the Ultra Megalopolis, Soliera lured Stakataka to the Megalo Tower, forcing Sun and Moon to battle it. After Stakataka was defeated, Necrozma was alerted to Lunala's presence. Necrozma released Solgaleo and leapt off of the Megalo Tower to try and absorb Lunala as well. Sun and Moon tried to assist Lunala, but were stopped by Lusamine. A comment from Sun angered Lusamine, who sent out a Nihilego and had it fuse with her.
In PASM31, Necrozma fled to the top of Megalo Tower while Lusamine chased after it. Zossie and the others tried pursuing them, but were sucked into an Ultra Wormhole Necrozma made, dropping everyone into the skies above Mount Lanakila. Soliera and the others later witnessed Necrozma battling against Zygarde in its Complete Forme. During the clash, Necrozma opened a wormhole, summoning Dulse to Alola. It absorbed the Ultranecrozium Z Dulse had with him, allowing Necrozma to transform into Ultra Necrozma. The Ultra Recon Squad decided the best option to stop Necrozma was to capture it, but due to Lusamine's meddling, there were no Beast Balls left to use. Nanu stated he could have another Beast Ball delivered, but told Sun and Zygarde to keep Necrozma busy while they waited for it to arrive.
Later, Moon joined in the battle, and with a combined attack from Zygarde, Lunala, and Solgaleo, Necrozma was finally downed. Anabel arrived with the final Beast Ball, but it was destroyed when Necrozma launched one final attack. Sun revealed he picked up the Beast Ball Moon tried using on Lusamine earlier, which Anabel decided to let Zossie use. Zossie captured Necrozma with the Beast Ball, hoping that it could one day be healed of its injured state.
Several months later, Soliera rejected the Aether Foundation's request to do cooperative research with them, stating she would only do so with Moon.