Unofficial Tiers
We have so much activity on Pokemon Showdown that I feel comfortable defining "OU" lists for a few other metagames. Treat these as "threat lists" for the various metagames, or use them to play "UU" versions of the metagames by banning these Pokemon.
To refresh your memories,
Little Cup Ubers: Carvanha, Meditite, Gligar, Scyther, Sneasel, Tangela, Vulpix, Yanma
Little Cup OU: Abra, Aipom, Archen, Aron, Axew, Bronzor, Chinchou, Clamperl, Cottonee, Cranidos, Croagunk, Cubone, Diglett, Dratini, Drifloon, Drilbur, Duskull, Dwebble, Elekid, Ferroseed, Foongus, Frillish, Gastly, Hippopotas, Houndour, Larvesta, Lileep, Machop, Magnemite, Mienfoo, Misdreavus, Munchlax, Murkrow, Natu, Onix, Pawniard, Ponyta, Porygon, Scraggy, Shellder, Slowpoke, Snover, Staryu, Taillow, Timburr, Zorua
CAP OU: Abomasnow, Arghonaut, Colossoil, Cyclohm, Dragonite, Ferrothorn, Fidgit, Gastrodon, Genesect, Gliscor, Heatran, Kitsunoh, Krilowatt, Mollux, Necturna, Ninetales, Politoed, Pyroak, Revenankh, Salamence, Scizor, Stratagem, Syclant, Tomohawk, Tornadus-Therian, Tyranitar, Voodoom
Ubers OU: Arceus, Arceus-Ghost, Arceus-Steel, Blaziken, Blissey, Darkrai, Deoxys-Attack, Deoxys-Speed, Dialga, Excadrill, Ferrothorn, Forretress, Garchomp, Genesect, Giratina, Giratina-Origin, Gliscor, Groudon, Ho-Oh, Kabutops, Kyogre, Kyurem-Black, Kyurem-White, Latias, Latios, Lugia, Manaphy, Mewtwo, Palkia, Rayquaza, Reshiram, Shaymin-Sky, Tentacruel, Terrakion, Thundurus, Tyranitar, Zekrom
Suspect OU: Alakazam, Amoonguss, Breloom, Bronzong, Celebi, Cloyster, Deoxys-Defense, Dragonite, Dugtrio, Espeon, Ferrothorn, Forretress, Garchomp, Genesect, Gengar, Gliscor, Gothitelle, Haxorus, Heatran, Hippowdon, Infernape, Jellicent, Jirachi, Keldeo, Landorus, Landorus-Therian, Latias, Latios, Lucario, Magnezone, Mamoswine, Ninetales, Politoed, Reuniclus, Rotom-Wash, Salamence, Scizor, Skarmory, Starmie, Tentacruel, Terrakion, Thundurus-Therian, Tornadus-Therian, Tyranitar, Venusaur, Volcarona
Differences between Suspect OU and Official OU:- In Standard OU but not Suspect OU: Abomasnow, Blissey, Chansey, Donphan, Gastrodon, Gyarados, Hydreigon, Jolteon, Metagross, Toxicroak, Vaporeon
- In Suspect OU but not Standard OU: Amoonguss, Bronzong, Garchomp, Gothitelle
Take this with a grain of salt (don't assume that a SV-banned / Chomp-allowed metagame would necessarily be this much more centralized), as people on the Suspect ladder are more likely just wanting to try out 'Chomp & pals.