Blaziken is in the Ubers tier because of it's hidden ability. I've never seen anyone use a Blaziken with Blaze competitively and I cant find a set beyond D/P that recommends it.
I think most of us are ok with using Smogon's OU rules as a basis for our own and then making changes that we all agree on. Spoiler: Smogon rules OverUsed OverUsed, or OU, is Smogon's standard tier. The highest level of play is generally seen in this tier, and it is the basis for all other tiers. The most powerful Pokémon are banned from this tier up to Ubers. Pokemon cannot rise from OU to Ubers based on usage. Most of the cover legendaries in addition to select other Pokémon are on the banlist. Play Restrictions Endless Battle Clause: Any moveset on any Pokémon that is capable of intentionally causing an endless battle is banned from competitive play. Thus: A Pokémon may not carry Recycle and hold a Leppa Berry in conjunction with Heal Pulse and Milk Drink, Moonlight, Morning Sun, Recover, Roost, Slack Off, Soft-Boiled, or Wish. A Pokémon may not hold a Leppa Berry and carry Recycle and Pain Split on its moveset. A Pokémon may not hold a Leppa Berry and carry Recycle and Fling on its moveset. Evasion Clause: The moves Double Team and Minimize are not permitted in play. Moody Clause: Pokémon with the ability Moody are not permitted. OHKO Clause: A Pokemon may not have the moves Fissure, Guillotine, Horn Drill, or Sheer Cold in its moveset. Sleep Clause: Only one Pokémon may be put to sleep on the opposing team at a time, if not induced by a move such as Rest. Species Clause: Players cannot have two Pokémon with the same Pokédex number on the same team. Pokémon may be up to level 100. Banned Pokémon Arceus Blaziken Darkrai Deoxys Deoxys-A Dialga Genesect Giratina Giratina-O Groudon Ho-Oh Kyogre Kyurem-W Lugia Mewtwo Palkia Rayquaza Reshiram Shaymin-S Xerneas Yveltal Zekrom Banned Items Gengarite Kangaskhanite Lucarionite Banned Moves Swagger Please reply with any changes you think should be made to these rules or any additional rules you feel should be added.
I don't see a reason to not follow smogon's OU rules. Everything we've brought up so far is covered by them, and we can just remove certain clauses if we feel the need to.