I run Skuntank in OU, fuck everyone. Tiers are for losers.
Hate to contribute to the derail, but i agree entirely, purely from the basis of: if you only use OU, without considering *why* something is in a lower tier, yo're failing your team.
Many things end up in lower tiers because they are outclassed by something else in many teams, BUT are still very viable in an OU team
Hitmontop: not the best spinner, intimidater of fighting type user. But on a team of 6 you can free up a lot of space by using hitmontop to fill roles you require.
Umbreon: if ypu require heal bell, it's probably the best mixed bulk user there is, but due to it being a niche requirement, not in OU.
Sometimes im not even sure people undrrstand the cut off between tiers is just a pretty arbritrary usage percentage...