As has been stated, I certainly wouldn't give it to all BBEGs.
That said, giving it to one particular monster is fine - especially if you give it to one that who is intended to be particularly mobile and/or annoying.
We have a reaccuring baddie in the campaign that I play in who has it (or something similar). She's a mercenary that we keep coming across (she keeps having jobs that bring her in conflict with the party) but, for whatever reason haven't had the opportunity to kill her yet. She's a mobile knife fighter, so it suits her pretty well - I know that the last time we met, she put some serious hurt onto my poor drow sorceress.
That said, that particular BBEG is more annoying due to her reoccuring appearances moreso than any particular powers she might have.