Seems like we have clairvoyant here ...
Shame he isnt very good one.

Helm sees all! Know that, and be judged! In all seriousness, though; hop unto Youtube and find a BG/Bg2/IWD Playthrough. Any. Not a single person does not have an 18 in any relevant stat.
Note: That is unless it's modified by race, halflings get -1 STR +1 Dex, dwarves +1 Con, -1 Dex etc].
Also note that in BG1 there are *three* tomes that increase WIS by 1, so all Wizards/Sorcs take 15 Wis so they can cast Wish at 18 WIS later.
Note 2: I exclude IWD2, because it's more-or-less 3E and has point-buy. I also notice that I'm taking this topic well away from what it is intended to be for, and that the Queen us to leave this place... I will. Sorry about that.