Morita is the Ranger of a Pokémon nature preserve located somewhere between Verdanturf Town and Petalburg City. He let Ash, Brock, May, and Max stay at his home in the preserve while they nursed an injured Swablu back to health and attempted to teach it to fly again. He commended May's efforts when Swablu healed after several days of treatment. Meanwhile, he was able to locate Swablu's flock at a nearby lake.
Nuzleaf is Mr. Morita's partner Pokémon and is usually on his shoulder while the pair work in the nature preserve.
After Swablu was separated from its flock due to a thunderstorm, it was found by Ash and his friends. Mr. Morita hosted the group at his cabin while they, and in particular May, nursed it back to health until its flock came back. During Swablu's time with the group, it was revealed that it had developed a fear of flying because of the incident. Ash and his friends took care of the problem by having their Pokémon demonstrate the ability while Morita searched for its flock.
Morita was driving the group to the lake when his car got a flat tire. It was later revealed that James' Cacnea's Pin Missile causes the flat tire as a part of a ploy for Team Rocket to steal Swablu. Fortunately, Swablu managed to overcome its fear in the end when Team Rocket was defeated. Afterwards, Swablu was returned to its flock when they flew by.