Blaziken shouldn't really be Ubers anymore.
1. He is easily walled by many OU pokemons and even some of the lower tiers. I do not want to go deep into what is check and what is a counter, but here's the list on the top of my head: slowbro, azumarill, tapu fini, salamence, dragonite, lando-t, toxapek, and to lesser extent, lati@s, mew, alowak(without knock off), rotom-w and -h, gyarados, mantine, even cresselia and jellicent
2. Even with speed boost, blaziken is not impossible to revenge kill. He is weak to aqua jet, water shuriken and pinsir's quick attack
3. Two of Blaziken stabs moves come with huge drawbacks: Flare Blitz has a great recoil, while HJK is a risk of missing and crashing.
4. Blaziken must run protect, which leaves it only 3 moves to choose from. With two stabs, that's either coverage move or swords dance. In either way, that's a huge drawback, which again, makes it easy to wall.
