I'm a chaining freak. :3
Caught shinies of Magnemite, Larvitar, Doduo, Snubull, Electrike, Voltorb, Bidoof, Starly.
Randomly encountered shiny Roselia once in Pearl, but started a new game.
My favorite encounter though was random shiny Swinub, LG, in the ice caves on like Isle 4. Blue Swinub...