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In my Jap import of Pokemon Gold.
It was a Nidoran M. I saw the shine, caught it and used it because I loved it. Didn't realize until Lake of Rage it meant anything.
Then I got a Skarmory and Trapinch in Gen 3, and a Machop and Buizel in Gen 4. Caught two in one day in Black, a Lillipup and a Swellow. My Gen 6 shiny was a Tentacool as my first encounter with surf.
I haven't done any MMing, but I know it won't be as exciting.