To battle for the Bluk Berry, Drew sent Roselia against May's Beautifly. Beautifly tried to attack Roselia, but was knocked down by Roselia's Petal Dance and Stun Spore attacks. Roselia attempted to defeat Beautifly with Magical Leaf, but May gained confidence; Beautifly stood up and countered the attack with Silver Wind, surprising Drew. Just then, Team Rocket stole the Bluk Berry. The heroes went after them, but Team Rocket used a device to absorb electricity. Drew had Roselia use Solarbeam to destroy the device and repeated the attack, along with Pikachu's Thunderbolt, to blast Team Rocket away. During the end of the day, Drew and Roselia watched the fireworks in Slateport City. Some days after, May remembered Drew and Roselia, wanting to face against them in the upcoming Contest.
Drew sent Roselia in Slateport City's Pokémon Contest. There, Roselia started with Petal Dance, then used Magical Leaf and Stun Spore combo to dazzle the audience. Roselia disappeared in its Petal Dance, only to cut the petals with Magical Leaf. This stunned the judges, who gave Drew and Roselia 29.4 points. Afterwards, Roselia battled in a Contest Battle against May's Beautifly. Beautifly tried to gust away Roselia's Magical Leaf, but due to it being an unmissable move, Beautifly got hit. Roselia emitted Stun Spore, so Beautifly tried to use String Shot, but the string was cut by Magical Leaf, causing May to lose even more points during the battle. Beautifly attempted to attack with Silver Wind, but was countered by Petal Dance. Roselia managed to launch Solar Beam, countering String Shot and defeating Beautifly, causing Drew to pass the round. However, May watched from the screen as Drew and Roselia were struggling with Robert and his Milotic. Roselia was hit by Milotic's Iron Tail and used Magical Leaf, but was countered by Milotic's Twister. This ended the Contest Battle, causing Drew to lose.
While battling Victoria of the Winstrate family, May saw Roselia and immediately remembered Drew and his Roselia. This fueled her anger and managed to defeat Victoria.
Ash, who was called by Drew as a coward for not entering the Contest in Fallarbor Town, challenged Drew to a battle, sending Taillow against Drew's Roselia. Taillow started off with Quick Attack, damaging Roselia and evading its Magical Leaf attack. Roselia launched Petal Dance attack, but missed. Taillow attempted to use Peck, but Roselia spouted out Stun Spore, which negated Taillow's attack. Using Solar Beam, Drew's Roselia defeated Ash's Taillow. During the Contest in Fallarbor Town, Drew managed to win the first round of the Contest by having Roselia use Petal Dance to dazzle the judges. In the next round, Drew battled Grace and Medicham. Roselia started off with Magical Leaf, but Medicham's Meditate allowed it to dodge the attack. Medicham retaliated with Ice Punch, but missed. Roselia tried to attack with Petal Dance, though Medicham used its psychic powers to redirect the attack back to Roselia. Roselia launched Solar Beam, but Medicham started using Ice Punch on the ground, causing the icy pillars to redirect the attack back to Roselia. With High Jump Kick, Medicham defeated Roselia.
During his stay at Verdanturf Town, Drew was challenged by the Phantom. Roselia struggled to battle the Phantom's Dusclops, who used Shadow Punch and Will-O'-Wisp, which defeated Roselia. The Phantom left, while Drew took Roselia to the Pokémon Center. The heroes visited Drew, who showed Roselia was too wounded and couldn't recover in time for the Verdanturf Town's Contest.
Once the heroes arrived in Rubello Town, they met up with Drew. Drew, however, was approached by his fans, from which one showed a picture of him and Roselia. During the first round of the Contest, Drew sent Roselia, who used Petal Dance, until Drew snapped his fingers. This dazzled the judges and the audience, including May.
In Kanto, Roselia appeared less often due to the fact that Drew was catching more Pokémon. At some point during Drew's travels in Johto, Roselia evolved into Roserade and was shown in a flashback using Mega Drain against one of May's Pokémon. It also appeared along with Drew, Harley and Solidad watching May in the Wallace Cup.
|Petal Dance||Now That's Flower Power!|
|Stun Spore||Now That's Flower Power!|
|Magical Leaf||Now That's Flower Power!|
|Solar Beam||Now That's Flower Power!|
|Mega Drain||A Full Course Tag Battle!|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.