Re: Simple Questions/Simple Answers v.4 (Gen IV/V)
MEH. Thanks for the answer.If by that you mean the man who tells you what your highest IV is, he's in the Battle Tower in the northeast corner. The Battle Frontier doesn't appear until after beating all 16 Gym Leaders, so yes, you need to beat the Elite Four and all the Gym Leaders first.
If you mean something else, then there is no other way in-game to check IVs.