I've been pondering doing SR for shiny squirtle because I'm crazy. How would you do it? Would you battle prof. Sycamore and when you see that squirtle isn't shiny in battle, soft reset? Thanks
Yes, you would have to battle Sycamore and then reset until you get a shiny.
It's unfortunate that you have to battle him...
You can't soft reset in X and Y.
So you will have to go the the home menu, close the game and and go into it again. But yeah, close and reopen when you see that the Squirtle is not Shiny.
Getting a Shiny will take an awful lot of time, so remember to be patient.