This list is made while giving top priority to where a certain episode/movie/short fits in best and second priority to release dates, i.e. chronological order. I've tried to be as accurate as possible in the placements of these in the "right" order, taking help from reliable places like Bulbapedia. If you have any disagreements, feel free to point it out.
https://www.gamefaqs.com/boards/217-pokemon/69236080
Gotta catch 'em all!
Missing:
23rd Pikachu short: Sing Meloetta: Search for the Rinka Berries
25th Pikachu short: Eevee & Friends (released with Genesect and the Legend Awakened)
27th Pikachu short: Pikachu and the Pokémon Music Squad (released with Hoopa and the Clash of Ages)
Made to have every single pokemon entry. I personally sort release date.
Pokemon
by Philip J MacAoidh