I would like to heavy mention or even a slash for Night Shade on Jellicent. Night Shade means that Jellicent can actually break the Subs of Keldeo/do consistent damage even when boosted. Similarly it also allows Jellicent to touch a boosting Volcarona and Gyarados. It isn't necessarily a bad move for stall breaking either since it does significantly more damage against bulky targets than Scald >_>
While gimmicky, maybe have the time to add on an all-out-transform set. It isn't necessarily outclassed by ditto because it isn't tied to scarf. While Transform is slapped on there you can make mew very annoying to take down with Softboiled+Heal Bell. Speaking of Heal Bell, maybe put emphasis on it because it is one of OU's few clerics?