Geez, this thread is such a depressing read at times; I feel so bad for all of these Shiny Pokemon mishaps, as well as Trainers who have never even seen/encountered a Shiny Pokemon.
Wow; that's so sad...I take it that you don't rebattle him, even for the experience?
I'm guessing you two are referring to Stat Trainers..? These guys seem to be ruining a lot of people's shiny Pokemon experiences... XD
I'm always worried about the day coming where I find a shiny Pokemon that has an easy way to flee or self-inflict the Faint status, most notably in the Safari Zone or something. >.<
As for me, I'm grateful to have at least encountered multiple Shiny Pokemon, and catching my first one, at that. However, my worst shiny experience is probably losing every single shiny Pokemon I've owned, TWICE (or possibly even THRICE, since I've lost 2 cartidges and 1 save file). The first instance is when I lost my Sapphire cartridge, which contained my first Shiny Pokemon ever, a shiny Golbat (from Meteor Falls, IIRC). I lost a second Sapphire cartridge as well, but I can't remember whether any shiny Pokemon were there, too. I know for a fact that I've had a shiny Golbat on one of the two Sapphire cartridges, though.
The second (or maybe third) instance is when my Emerald save file got deleted (from what I can tell, this was purely due to the cartridge accidentally jiggling/joggling while I was saving right before a Secret Base battle; no cheating devices have been used on the Emerald cartridge). If memory serves correctly, I had a shiny Fearow (traded over from FireRed and a shiny Surskit (which I hatched in Emerald). Instead of recovering the previous save file, the game goes and tells me "The save file has been deleted due to corruption or damage.", at which point I basically cried. In my current Emerald save file, I have a Shiny Whismur from Desert Underpass (which is the only Shiny Pokemon I currently own/can prove the existence of, for now), so I guess that's something. :/
My other "worst Shiny experience" is encountering a foe Shiny Kingdra in Hoenn's Battle Tower, encountering a foe Shiny Ampharos in Hoenn's Battle Factory (which I owned for a while when I swapped for it ), and being offered a Shiny Charmeleon at the start of a Hoenn Battle Factory run (which I selected, of course). The reason these are bad Shiny experiences is because I can't outright own the Pokemon in question...the Battle Factory examples are probably worse, since I get teased with the Pokemon and can only own them for up to seven battles. XD T_T
Other than the above, I'm constantly paranoid of encountering a Shiny Pokemon (shiny starter Pokemon, Birch's foe Poochyena, Wally's Ralts, etc.) whenever I temporarily start a new game/save file. I grapple with the question of whether or not I would consider restarting my 900+-hour save file just for a shiny Pokemon (most likely, it would have to be 2 Shiny Pokemon, or a Shiny Pokemon I like more than Shiny Whismur). The stories I'm reading in this thread aren't helping matters any. XD