Pokemon tiers are classes of pokemon, based on potential and usage. The tiers are as follows:
Uber- Pokemon in this tier are deemed too powerful for Overused (OU), or Standard play. Ubers are Arceus, Darkrai, Deoxys (all forms*), Dialga, Garchomp**, Giratina, Groudon, Mewtwo, Mew, Wobbuffet*, Ho-oh, Kyogre, Latias, Latios, Lugia, Palkia, Rayquaza, Shaymin (Sky Form***), and Wobbuffet****).
*Deoxys Speed Form was considered for OU play, due to having balanced stats, but is too good of a lead Pokemon.
**Garchomp can overwhelm the majority of OU teams so it is being considered for the Uber tier.
***Shaymin Land Form suffers a major inferiority complex to Celebi, another OU, but its alternate form is much more powerful.
****Wobbuffet's moveset, ability, and stats make it too deadly for OU play.Shaymin Land Form suffers a major inferiority complex to Celebi, another OU, but its alternate form is much more powerful.
OU- Overused are the most powerful and commonly used Pokemon that aren't Uber. Ex. Blissey, Bronzong, Gyarados, Metagross, Salamence, Skarmory.
Borderline, or BL- Not an actual battling enviroment, Pokemon in this "tier" are too powerful to be Underused, but can't really compete in OU. Ex. Articuno, Charizard, Crobat, Empoleon.
Moderately Used, or MU- The upper tier or Underused. Ex. Absol, Blastiose, Gardevoir, Hitmonchan.
Underused, or UU- This tier inclues Pokemon that aren't strong or popular enough to be in a higher tier. Ex. Altaria, Linoone, Pikachu w/ Light ball.
Never Used, or Nu- Pokemon that aren't good enough to compete even in UU.
In competitive Pokemon battling, Pokemon are separated into "Tiers" or ranks, depending on how powerful they are and their usage, The two main tiers are OU (Over Used) and UU (Under Used), when a Pokemon is not powerful enough to fit into the OU Tier, yet too powerful for the UU Tier it is placed into the BL (Border Line) Tier. For more reading on the subject of tiers I suggest visiting a Pokemon fansite with a competitive battling section.
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