I've encountered far too many to fully remember. Duels at Dawn gets really mad at my insane luck when it comes to shiny pokemon.
I remember finding a shiny Abra back in Crystal but it used teleport and that was the last I heard of shinies for a while. I found a Wingull and Marill in Ruby on seperate playthroughs. Came across a shiny Quagsire in the Safari Zone in Pearl and it promptly ran away. But I found a shiny Clefairy after backtracking through Mt. Coronet. I managed to snag a shiny Bagon in Platinum while trying to chain for a shiny Swablu and the chain was only at 20-something. My White Version is what holds my record of most shinies with 4 shiny pokemon in one playthrough. I got a Solosis found in some double grass while looking for a Trubbish for my dex, a Zorua using the Masuda Method, a Petilil while EV training for Sp. Attack by killing off Petilils (I laughed at the irony) and the very next day I caught a shiny Delibird while exploring the Giant Chasm.