mindless moans
Bobsplosion
It's wholly possible, I believe.
If it's from an event where you get it in the Pokemart, then no, it can't be (unless the event involved it being shiny.)
But if it's from the GBA games, one could have just reset in front of Jirachi until it eventually was shiny.
was there an event for it on GBA?
i was never sure of that
There definitely was. I can't tell you which game it was, because I'm horrible at remembering the difference between the GBA's. But I THINK it was Ruby/Sapphire/Emerald.
It was easier to get shinies back then, (Black and white changed the shiny ratio from 1 in 8000 something to 1 in 12,000 something.)
Be aware, it would be almost impossible to find someone willing to trade a legit shiny legendary.
98% of what you find will be AR'd.