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First shiny was in Gold, a Koffing in the Burned Tower. I was just a kid so I thought it was a glitch and turned off my GBA to be sure.
It took around ten years for me to find another shiny, in SoulSilver, funnily enough. It was Tentacool east of New Bark Town, which is cool because shiny Tentacruel looks great.
Got a bunch of shinies from Masuda-ing now though.
Fuck, I need to get a shiny Koffing and call it Gold.