Misdreavus

With the transition to BW came the Eviolite, and because of it, many Pokemon were forever changed. Misdreavus is a prime example of this, as when equipped with an Eviolite, its lackluster defenses rise to impressive levels, and when combined with a fantastic defensive typing and ability, it is a formidable defensive threat in NU. Combine that with an excellent support movepool, a satisfactory offensive movepool, and the ability to spinblock, and you can see why Misdreavus is one of the most viable Pokemon in the tier. Its main niche in the metagame is that of a bulky supporter and spinblocker, but Misdreavus can easily become an unexpected offensive threat as well. Spikes-stacking is a very powerful strategy in NU, which only heightens Misdreavus's usefulness. Sadly, though, Misdreavus's great bulk is severely hindered by its lack of reliable recovery (it can't even utilize Leftovers), and is prone to being worn down. Still, none can perform Misdreavus's job quite as efficiently.