I may be wrong, but I believe there is no way to get a shiny solar power charmander.
It is my understanding that the pokemon from the dw, who are also found at level 10, cannot be shiny. To get a shiny dw pokemon, you have to breed it from a female with the dw ability. I believe there is no way to get a female charmander with solar power, the event was only male. Again, I say that I am not sure, but that is my understanding.
Either the charmander is hacked, or the parent was hacked.
If you get the reference in my title, consider yourself e-hugged.
My White fc is 1463 5597 6150