How come the focus band is almost always banned in competitive battles?

Question

It seems to be inferior to the focus sash, so why would anyone ever use it? Is their some haxy strategy the involves the focus band?

Answer 1

Because items that rely on chance are banned.
>... that rely on chance, such as Focus Band and Quick Claw are banned. -Bulbepedia

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And not many people would want to use it. If you want to have a 10% percent chance of surviving, be my guest :P

Hope This Helped :D