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.
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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.
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When Ash encountered this particular Noctowl, it was being captured by another trainer.
Shiny Pokémon species are even rarer than legendary in the anime
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Pokémon Shiny has always been very rare, always appearing at a rate of 1:8000.