Regice in USUM was way harder to catch than Regice in RSE (Ruby, Sapphire, Emerald). I literally stocked up 1036 Ultra balls for the first time. and guess what? NONE OF THEM LITERALLY CAUGHT REGICE. i did a second run this time was being a shiny regice I STOCKED UP LITERALLY 2.5k Ultra balls and 10 great balls, NONE OF THAT WORKED I SPEND 2-3 HOURS FOR TRYING TO LITERALL POKEMON AND STILL NEVER CAUGHT IT. then I gave up for one year then came back. and I STILL NEVER FREAKIN CAUGHT IT. at this point I was just beyond pi***d. I gave up, left, another 2 years then I tried again and caught it