I was disappointed that they didn't use stereo for Pokémon Sun and Moon but then they would had to have decided if Lusamine's hair formed a sheet or a cone wheras the animation is strangely ambiguous about the issue as it is.
Most 3D TVs use a high frame rate panel and shutter glasses, somewhat like Lenny Lipton's (Cornell physics grad who wrote the lyrics for Puff the Magic Dragon)
https://en.wikipedia.org/wiki/RealD_3D
which uses a double-pumped projector and a device which electrically rotates polarized light on alternate frames so that circular polarized lenses on the glasses work like the shutter glasses. (I'm a little sad that I never got to see https://en.wikipedia.org/wiki/Dolby_3D)
You don't lose quality in principle from this scheme but you do lose brightness and the real answer is "it's complicated" when you change the frame rate.
Most 3D TV however is in a side-by-side format where half of the horizontal frame is used for one eye and the other half is used for the other eye so you really do lose some horizontal resolution.
My best 3D viewer right now is a Meta Quest 3 on which I've watched Space Station 3D and The Rise of Skywalker though sometimes I think about picking up a used 3D TV. If a monitor or TV supports high frame rates you could get 3D for free if it wasn't for the shutter glasses being rather expensive.