On the Shiny Reshiram/Zekrom in dragonspiral tower.
14 years ago
General
I've verified that it's still affected by the anti-shiny check so there is no way to obtain it shiny without cheating. Sorry folks, but don't waste your time on this little rumor.
FA+

At least the shiny you saw can't use SelfDestruct. I would have caught that Graveler if I hadn't been so insistent to use Pokeballs instead of anything else. But if I had a choice of shiny Pokemon... I'd want Mightyena. :3
And actually, I forgot about back in Crystal... I did catch a shiny Growlithe. That was lucky, because it has Roar, it could have fled. I caught it right in front of National Park. :3 I need to figure out how to get another shiny Growlithe... and a shiny Poochyena. I guess it's a good thing I have Japanese versions of SoulSilver and Black. I can use the Masuda Method. :D