Odd Pokémon Out! : Season 9 Episode 16

While on the way to May's next Pokémon Contest, Ash and friends must stop at a nearby island to switch to ferry to the next island. They let their Pokémon out to play and Donphan, still as playful as ever, tries to play with some Rhyhorn, only to be chased by their parents. After being saved by Nurse Joy and her Meganium, Grovyle gets into a conflict with a wild Tropius and is beaten badly. Meganium heals Grovyle and Grovyle falls in love with the Herb Pokémon. However, it is later revealed that Tropius also has feelings for Meganium. Grovyle decides to have a rematch against Tropius to see who will come out on top.