Ash Ketchum ended his `mission` on the Pokémon cartoon in mid-March, after more than 25 years of traveling.
Ash’s rarest Pokémon was caught a long time ago
Those who watch Pokémon know that the cartoon’s catchphrase is trying to catch all the Pokémon.
Another case that can be mentioned is Poipole, an Ultra Beast species from aliens.
According to many fans, the rarest Pokémon Ash ever caught was a Shiny Noctowl that he encountered in the Johto region.
When Ash encountered this particular Noctowl, it was being captured by another trainer.
Shiny Pokémon species are even rarer than legendary in the anime
Pokémon Shiny has always been very rare, always appearing at a rate of 1:8000.