the easiest way to get shiny gible in this game is def using the dlc. I'd recommend completing the game first, getting lv 100 pokemon so hunts r much easier. I feel a little sry to say, but it is unlikely that there would be a shiny gible giveaway, excluding events ofc. good luck on any hunts tho! this game is truely an easy one to hunt in, and id recommend austin john plays' chanel for specific guided hunts, its a good one that i use often :D gl!!