I can't remember. The first Shiny I saw was a Beedrill in Silver's bug catching contest but it ran away. I did catch a Shiny Larvitar in the same game, but I can't recall if that was the first one I caught or if there was another in between them.
Much to my surprise I caught two Shinies in a row in Black 2, a Koffing and a Patrat. I didn't even have the Shiny Charm; it was pre-Castelia. Now if only I could have that kind of luck in Y.
"Help! Help! They've destroyed my cousin's brain!! Oh, my god! They've already milked you, haven't they?!!" -- Phoncible P. Bone