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It's worth pointing out that the Pokédex entry for Goldeen in Yellow, and then again in Let's Go Pikachu/Eevee, makes reference to them laying eggs.
>When it is time for them to lay eggs, they can be seen swimming up rivers and falls in large groups.
The text pre-dates Gold/Silver and the introduction of Pokémon Eggs to the series, though as I recall the games were in development at the same time as Yellow.
