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Owned by Damian. Was later caught by Ash. Fire type.
James owned its pre-evolved form and he released it into the ocean, thus making it evolve. Water/Flying type.
One of the most notorious Pokemon released owned by Ash. Bug/Flying type.
Ash tried to release it so it could be with its own kind, but it returned. Electric type.
Jessie caught it but it was eventually released on accident and it clamped to a Slowpokes tail. Water type.
Ash owned it and flew on its back in the air. Normal/Flying type.
Ash owned it in the Orange Islands for transportation but released it so it could be with its family. Water/Ice type.
Owned by Zachary. He released it because it could not control its sonic power of its wings, breaking every window in town. He eventually released it, but Ash returned it to him. Bug/Flying type.
Two of these same species were relased in the same episode, one owned by James and the other owned by the Magikarp Salesman. The two Pokemon ran into the forest after they fell in love, never to be seen again. Grass/Poison type.
Jessie has owned this Pokemon since Kanto and was released to save a group of poached Ekans. Poison type.
James has owned this Pokemon since Kanto and was released to save a group of poached Koffing. Poison type.
Misty owned it and she released it to protect the Togepi of the Mirage Kingdom. Fairy/Flying type.
Paul caught 3 of them and released them because they were "not up to his standards" and because he wanted them in his Pokedex (dude who the heck does that...)
Paul owned it but released it because its only known move was Tackle (dude, plz stop just catching them for your Pokedex and releasing them bcz they have one move, you level them up to get moves you idiot).
Dawn owned it and tried to release it but it came back to her. Electric type.
Paul owned it and released it and gave it to Ash (boi I swear if you release another Pokemon)
Two were released in the same episode due to being in love with each other. Bug/Poison type.
Shamu owned it but released it and Ash eventually caught it. Fire type.
Cilan owned it in a fake fishing contest by Team Rocket. They caught all the Pokemon entered in the competition, but a Frillish freed all the water Pokemon, including it.
James owned it and it eventually ran off to follow some Malamar. It eventually returned. Dark/Psychic type.
One of Jessies main Pokemon. It got lost after being blasted off by Pikachu and eventually grew a bond with a female Wobbuffet.
Owned by Ash. It was released to protect a lake from danger that had Pokemon at it. It eventually returned to Ash could fight the Elite 4. It was later released back to the lake to stay.
Ash released in Kalos so it could protect Kalos from any disasters along with Z2.