Roserade first appeared as Budew in Dawn of a New Era! performing a Sunny Day, which stopped Ash and Dawn from fighting. Nando appears with his harp and tells the group that the Budew is his. He battles Dawn with his Budew while Dawn uses her Piplup, despite Piplup having the type-disadvantage. As Piplup was about to use Peck on the Bud Pokémon, Budew dodges and covers itself up with smoke. Piplup then uses BubbleBeam which made the smoke disappear but was proven ineffective against Budew. Budew strikes up a SolarBeam and as Piplup was about to use Peck for a second time, Budew's SolarBeam already made contact and took out Piplup.
Later, Budew battled Team Rocket as Carnivine was about to attack Piplup and took Carnivine out in one hit. The next morning, Budew battled Ash's Pikachu and used some healing moves to avoid losing energy. It evolved into Roselia during the middle of their battle. However, despite the evolution, it lost to Pikachu as he dodged Roselia's SolarBeam.
Nando and Roselia reappear in A Secret Sphere of Influence! at the Eterna Historical Museum. Prior to the events of the episode, it had a Gym battle with Gardenia's Turtwig and wins. Nando is taken in along with Roselia for some questioning. Around the end of the episode, Nando was proven innocent.
In Dawn's Early Night!, it teamed up with Kricketune in the Hearthome Contest during the battle round of the Double Performance. They battled Jessie's Seviper and Dustox and won.
During Nando's long absence, Roselia evolved into Roserade. It was not seen in the appeals round of the Sinnoh Grand Festival. In Coming Full Festival Circle!, it was sent out along with Nando's other Grass-type Pokémon, Sunflora during the Battle Round of the Double Performance. It was able to get Nando past the top 8.
In League Unleashed!, Nando sends Roserade out as his first Pokémon during his match against Ash in the Lily of the Valley Conference. It went up against Ash's Staraptor. During the battle, Roserade's Sweet Scent caused Staraptor to become temporarily immobile, which the Bouquet Pokémon followed up with Magical Leaf which scored a direct hit on Staraptor. Roserade then tried to finish off Staraptor with SolarBeam. Just when things were about to get bad for Ash, Staraptor got up and dodged at the last second. Staraptor finished Roserade off using his wild-card technique.
