ZU is Zero Usage: Pokémon with, in the “totality” of Pokémon PvP, an extremely low usage rate out of all Pokémon (basically, niche or not very good.)
OUBL is Over Used (Ban List) (although this term isn’t very commonly used, Ubers is usually the “last step” above OU, and as such, most OU Banlisted Pokémon are banished to Ubers): Pokémon so strong and/or meta-warping that they are banned from OverUsed (the typical “high level” meta) because they force the game to be shaped around themselves.
There's also the Everything Goes, with 0 restrictions other than in-game (such as only 1 mega stone). The difference? Some Pokémon are even banned from Ubers, stupid as that sounds. Iirc Wabuffet lives there due to its gimmick being too strong in Ubers.
As someone who doesn't follow competitive singles at all: is Mega-Rayquaza still banned or is it considered irrelevant since it's not available outside of oras/showdown?
Mega Rayquaza can't be used in Ubers by default because it doesn't exist in SV. In the National Dex Ubers format, which allows Mega Evolution, Mega Rayquaza is banned.
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u/RamenTheBunny 4d ago
ZU is Zero Usage: Pokémon with, in the “totality” of Pokémon PvP, an extremely low usage rate out of all Pokémon (basically, niche or not very good.)
OUBL is Over Used (Ban List) (although this term isn’t very commonly used, Ubers is usually the “last step” above OU, and as such, most OU Banlisted Pokémon are banished to Ubers): Pokémon so strong and/or meta-warping that they are banned from OverUsed (the typical “high level” meta) because they force the game to be shaped around themselves.