Retro Marill is a Retro Pokémon that was first introduced and given out during the Johto Apricorn Battle from 22/May/2018 to 12/Jun/2018 if a user ranked top 50. The Retro Egg could be claimed directly from the Apricorn Battle page.
It had also returned as a reward from the Johto Apricorn Battle as of 2019.
Hatching a Retro Marill egg will not count towards your Shiny Chain.
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Retro Marill does NOT evolve.