Clefable

To try to classify what exactly Clefable does is a monumental task. The reason for Clefable's greatness lies in her unique ability, Magic Guard. With Magic Guard, Clefable will only be hurt by attacking moves, which makes her a dream come true for anyone who hates stall, and a nightmare for stall users, who find their status effects and entry hazards rendered useless. Her stats may seem to leave much to be desired, but her movepool stretches out to the stars, giving her unparalleled versatility. Clefable can fill many roles, including supporting the team with Wish, sweeping with Calm Mind, wallbreaking with a mixed set, and more.

However, despite all of Clefable's perks, she does have some major flaws that drag her down. Even Magic Guard cannot mask Clefable's rather meager stats, which ensure that Clefable will always have trouble either walling things or garnering the power to 2HKO and OHKO targets. Her Normal typing is also much more of a curse then a blessing, leaving her with nothing in the way of resistances and a weakness to Fighting-type attacks, which are popular in UU. Regardless, Clefable makes for the ultimate "glue" Pokemon and can fit on nearly any team.