I'm rather curious as to how this would work. If you switch it in on a physical attacker, or something else that would switch out, and Rock Polish on the opponent's switch to a counter...your opponent will probably switch in his wall.
Perhaps you've done damage calculations, but it doesn't seem like
Bronzong's 89 Atk is going to be doing much to any decent wall. If you're lucky and your opponent switches in a special wall, you could still get a hit in, but your opponent would likely switch to a physical wall right afterwards.
Looking at some common physical walls - Skarmory, Bronzong, Dusknoir...89 base Atk does not seem like it would do much damage, except maybe from flinching Dusknoir with Iron Head. It seems like Bronzong would be forced to switch, as it really cannot do much.
A screen might be helpful in that situation. You could set up a screen on your opponent's wall, and switch to set up a sweeper. Once you show Rock Polish though (and it's hard to fake a normal set with those moves) a good opponent will probably realize it's not a walling EV spread and be more willing to attack it physically.
If you waited until late game to Rock Polish, though, you could probably finish off quite a few weakened opponents - especially if your opponent's main physical wall is heavily weakened.
Rock Slide would be better there for type coverage.
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Pearl: Purugly
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