Prior to the start of the Sun, Moon, Ultra Sun & Ultra Moon arc, Sun received Dollar from Professor Kukui.
Dollar debuted in The Grand Entrance and Delivery Boy Sun as a Litten. He was first seen helping to dry Moon's wet clothes with the heat from his flames. Later that day, Sun sent out Dollar and Cent to fight Tapu Koko. Due to their dislike of each other, Dollar and Cent immediately began attacking one another. After regaining their focus, Sun commanded Dollar and Cent to attack. Though the attacks seemingly did nothing, Tapu Koko fled, leaving behind a Sparkling Stone in the process.
In The Decision and the Tournament of Six, Sun participated in the Iki Town festival tournament. In the first round, Sun sent Dollar to battle against the Masked Royal's Rockruff. As he was forced to participate, Sun refused to fight seriously until he saw that the prize for winning the tournament was the island challenge amulet, which he planned to sell for money. After defeating Rockruff, Dollar faced off against the Royal's Munchlax. Though it kept hitting Dollar with a series of super effective Rollouts, Dollar eventually won the battle by setting the hairballs he kept leaving around the battlefield alight, causing Munchlax to be engulfed in flames, defeating it.
In The Party Crasher and Guzma the Destroyer, Sun faced off against Guzma in the second round of the tournament. Dollar battled Guzma's Masquerain, but he was defeated after his Fire-type moves were weakened with Water Sport.
In the final round, Sun faced off against Gladion, with Dollar battling Gladion's Type: Null. Sun attempted to defeat Type: Null by setting the inside of its helmet alight with Dollar's flames, but Gladion easily saw through the attack and mocked Sun for not taking the battle seriously. Sun became angered by Gladion's claim, which caused energy from a nearby Ultra Wormhole to be absorbed by Sun's Sparkling Stone. The energy powered Dollar's Ember into a powerful but incomplete version of Inferno Overdrive that defeated Type: Null, but caused Sun to pass out. Hala, realizing that Sun got a Sparkling Stone from Tapu Koko, declared Sun the winner of the battle.
Dollar and Sun preparing to use Inferno Overdrive
In The Wild Full-Power Pose of Fire, Sun learned about Z-Moves from Kiawe. In order to face Gladion, who had kidnapped Tapu Lele, Sun had Kiawe teach him how to perform the pose for Inferno Overdrive. With this and the Z-Ring delivered by Kahili from Hala, Sun and Dollar successfully used Inferno Overdrive on Gladion's Type: Null. Though Type: Null didn't faint, its helmet started to crack, forcing Gladion to return it and switch for Porygon. Sun tried to have Dollar use Inferno Overdrive again, but the move failed, giving Porygon the opportunity to defeat Dollar.
After Gladion left, Tapu Lele awakened. Once fed the Mirage Berry Sun was tasked to deliver to it, Tapu Lele started showering the group with its scales, healing Dollar in the process. When Tapu Lele asked the group to battle it so it could test their strength, Dollar was used alongside Moon's Mareanie, Kiawe's Marowak, and Kahili's Skarmory to face the guardian deity. Despite the combined effort of their attacks, Tapu Lele easily blew the group away. As his Trainer refused to give up, Dollar evolved into a Torracat and managed to land a hit on Tapu Lele. While the attack didn't harm Tapu Lele, it acknowledged their determination and flew off.
In A Photoshoot and the Abandoned Thrifty Megamart, Sun was tasked by Acerola to take a picture of the Totem Pokémon that lived at the abandoned site of the original Thrifty Megamart. Some time after entering the building, Sun and Lillie were attacked by a Totem Mimikyu, forcing Sun to have Dollar battle it while he tried to take its photo. Due to Mimikyu's speed, Sun was unable to keep up long enough to snap a photo, forcing him to have Dollar use Inferno Overdrive in the hopes that the Z-Move's power would keep Mimikyu stunned long enough for him to take the shot. While the attack successfully hit, all it did was break Mimikyu's rag due to its Disguise Ability, leaving the Totem completely unscathed and ready to launch an attack at Sun. Eventually Sun managed to calm Mimikyu down and convinced it to join his team, which it accepted.
In Truth and the Mastermind Behind Team Skull, Dollar, along with the rest of Sun's team, helped to rescue Moon from an attacking Xurkitree. By combining their attacks, they managed to knock Moon from Xurkitree's grasp, though Xurkitree immediately retaliated by smacking them away onto a nearby car.
In Darkness!! The Mysterious Claws of Necrozma!, Dollar was used alongside the rest of Sun and Moon's teams to assist Lunala against Necrozma, but was stopped by Lusamine's Naganadel.
In Tyrant!! The Fiendish Man!, after returning to Alola, Dollar was used with the rest of Sun's Pokémon to battle Necrozma on Mount Lanakila. During the battle, Dollar was thrown into a cliff, causing him to evolve into an Incineroar.
