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A tentacool in a Japanese Silver I got before the game was released in the US (some shop in my area had import games and I didn't care it was in Japanese) found the guy on my way to get Ampharos's medicine so I found it even before the red Gyarados.
In honor to that, I've been MMing for one for two weeks and yesterday it finally hatched! Pic related.
I wanted to name it its Japanese name for that but for whatever reason some part of the name is censored, so I ended up naming it Gin (Japanese for silver)