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You know, I can't recall my first shiny... I think it was a Zubat found in the Castelia Sewers in Black 2. Too bad it was just a Zubat haha.
Ghastly is my most recent one, found in Ultra Moon. I barely even knew it was shiny at first because of the colour similarities. But the only shiny I ever hunted for was Shroomish. Love Shiny Breloom!
And I agree, Gen 7's long cutscenes can be a drag, especially on a second playthrough. Still, it's got a ton of great Pokemon!