just an fyi, the evs on the shuckle set you posted are incredibly inefficient. shuckle's defensive stats are 20 / 230 / 230. 252 evs always give a set amount of stats (63), and since shuckle already has such high defense / special defense, evs in those 2 stats won't impact that stat much. however, 63 points into hp will be much more impactful because shuckle has such a low hp stat.