I'll go with swoobat. It's just like a real bat, it's not ugly. It's cute when compared to real life bats, btw.
It's typing is cool and it has access to good movepools, such as Calm Mind + [puts special move here]. It covers it's not too great sp.att and sp.def, and it's supposed to strike first so it'll have at least one Calm Mind to increase it's special defense before it gets hit, and in the next turn it's already able to do a boosted damage on the foe.
EDIT: I forgot about it's ability. As Deceit said below me, Simple is the best ability for swoobat. It completety puts the Calm Mind set in a way higher level.
Substitute it's also a good choice, because it's a pretty frail mon.