The question is what would be the purpose of saying that? Does it mean that you have the skills necessary to do the job? No. Does it mean that you are a good team player and will help create an efficient working environment? Again, no.
Saying you have a high IQ is at best, a way to say one or two things, that you learn quickly and/or can solve the kinds of problems they have. But it’s ambiguous, because it doesn’t say whether you are saying one or the other and it’s not actually correct because it’s not true. You can score high on an IQ test test and neither learn quickly nor be able to solve the problems they have.
So, saying you have a high IQ isn’t really constructive.
On the other hand, at worst it can be either a lie or an attempt to brush over shortcomings. Either way it’s a bad thing.
There’s no real upside.
Practically speaking, you should, as writers say, show not tell. Don’t say you’re have a high IQ and can learn quickly, give evidence that you can learn quickly. Don’t say you have a high IQ and can thus solve problems they have, give evidence that you have solved similar to the problems they have.