[Demonskid]

Originally Posted by Bulbapedia

Dragonair first appeared in the banned episode, EP035, as a Dratini the warden of the Safari Zone was protecting. Over the 30 years since Kaiser last saw the elusive Dragon-type, it evolved into Dragonair. It also had a child Dratini.

Clair's Dratini evolved into a Dragonair in Beauty is Skin Deep.

In On Olden Pond, a Dragonair was living in a lake that Mr. Saridakis once planned to build a luxury resort on.
Minor appearances

Dragonair made a cameo in the Pikachu's Rescue Adventure, flying around the rainbow after the storm.

I never seen these episodes xD