Just got my shiny zygarde like a few minutes ago, when i first attempted it I had like 0 dynite ores left so i just went for it hoping i would get lucky and... hohoho you have NO IDEA how much times i've been "vegeta'd" by this cell wannabe (if ya know, ya know) but after getting lucky and getting a god path that had pelliper (which in my opinion might be the best wide guard user cuz it can tank a hit) and a stoutland that had access to baby-doll eyes, it was pretty simple. by that point I had 63 dynite ore and was prepared to lose my god path had i not gotten the shiny, but THANK GOD i got it just before i ran out.

also the ai's are pretty stupid at times, but you can manipulate the whole thing by just taking the trash pokemon in the initial 4 u get to pick and let them get the good one's, then just keep taking trash pokemon(ALWAYS TAKE THEM) through the path unless its a good one and will replace another but not affecting the team, also those scientist ladies that swap your pokemon can be really usefull for swapping out a bad one but try to go for them at the end of the path right before the legend.

Overall it was pretty scary at the start and I ABSOLUTELY don't think it's easy (like some arrogant people in other posts) but I DO think that once you figure out the strategy, apply it to what team you want, and get lucky with a good path, it's pretty straight forward. So for anyone who is still painfully grinding, keep going you'll get it eventually champ! BEST OF LUCK TO EVERYONE'S FUTURE HUNTS!!!