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Shiny Sandshrew back in Sapphire version as a kid. I caught the tail end of the animation, not sure if something happened. Then I noticed it looked slightly green, figured I'd try to catch it. Didn't realize until after that it was shiny like Gyarados was in Silver.
Still have him almost 12 years later, crazy how old it is. Since then, I've soft resetted, masuda'd, and caught a lot more but he was the first.