Why did you not use Spiky Shield?
In other news do we have any confirmation on what Bulletproof blocks specifically?
There's a bulletproof thread in uncharted territory that has a WIP list.
I went to battle spot and got beat up every single time with one hit KO , chesnaught is not good ... i tried these set ....and they always hit first
Were you switching into stray flying moves, or trying to use him as a wall instead of a defensive spiker?
While I don't think he'll be rampaging all over OU, I definitely think it'll be possible to use him, and in his own way, too. He has a multitude of safe switch ins due to bulletproof, and grass type powder immunities to set up spikes, and can hit pretty hard to boot.
As a pure hazard set-up and wall, he's well outclassed by ferrothorn and even Forretress. As a grass / fighting sweeper Breloom has it outclassed. IT's best (and only) shot is to switch in on something it walls, and then proceed to either set up spikes OR predict the switch to hit it hard.
Offensively, it gets Dragon claw, Shadow claw, powerful STAB in wood hammer or Seed bomb, and hammer arm. It can toxic certain switch ins if you choose to run it. While he definitely suffers from 4 move slot syndrome (You want spiky shield, spikes, leech shield, synthesis, and a multitude of attacking moves, hell maybe even Substitute), he can have various options.
To use in OU you'll need to be careful, and take out key threats such as talonflame, hurricane users, skarmory, and you'll need to be wary of special sweepers. I'm not familiar with UU so much, so I'm not certain how common fliers are down there. But he could see use down there as a ferrothorn-lite.