Saw three, caught one. Voltorb in Silver used self destruct or explosion or whatever and killed itself. Then I caught a shiny Girafirig in Emerald, and finally there was a shiny Gothita in Black, but I ran away because I was trying to get to another place quickly, and by the time I realized it was a shiny I was too late.
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I'd trade Pokerus over shiny anytime. Pokerus can always helpfully affect stats and is 3 times rarer than shinies. Shinies are only one Pokemon, sometimes not even good, and it may have terrible nature or IVs.
I've caught only one, a Budew, who is now a Roserade. I've ran into at least three -- Budew included -- a Poocheyna who was chasing Birch(had no idea about shiny Pokemon then and thought the game was glitching, and a Graveler in Iron Island with Riley. I had a shot at catching him, but then he used Self-Destruct.
Otherwise I acquired a few shiny Pokemon from a friend who figured out how to do the chaining process -- Nosepass and Electrike, and a few of the freebie ones that they gave away. Entei, Raikou and Suicine.