Bah dont worry about the server XD personnaly i always go to Pokemon online server
The tiers is smthing you change when you want to takle part for a specific battle like (double,triple,1vs1,)
There are 3 main tier:
-OU-Stand for OverUsed :In this tier you cannot have any of this pokemn in yur team:
http://www.smogon.com/dp/tiers/uber
-Uber-In this tier yu can use any pokemon yu want including legendairy
UU-Stand for underuse: its pokemn that are not used a lot :P: see this list
http://www.smogon.com/dp/tiers/uu
Bah dont worry about the server XD personnaly i always go to Pokemon online server
The tiers is smthing you change when you want to takle part for a specific battle like (double,triple,1vs1,)
There are 3 main tier:
-OU-Stand for OverUsed :In this tier you cannot have any of this pokemn in yur team:
http://www.smogon.com/dp/tiers/uber
-Uber-In this tier yu can use any pokemon yu want including legendairy
UU-Stand for underuse: its pokemn that are not used a lot :P: see this list
http://www.smogon.com/dp/tiers/uu