What is the point of perfect IV's if you aren't using

>>30701369
It doesn't matter. People who get caught up on the SpAtk IV being perfect on physical attackers are a joke, but are far and few.

>>30701369
You could argue that it matters to have a 0IV in Attack on your special attackers to minimize Foul Play damage, but at the end of the day, most pokemon function just fine with a penta perfect spread.
Same goes if you plan on using Trick Room, but then you're still looking for a penta 'perfect' spread just one of the 'perfect' IVs is 0 instead of 31.
The only time you ever need all 6 IVs is for mixed attackers or Hidden Power, like you mentioned.
t. autistic breeder

When most people say perfect I.Vs on a normal (not mixed sweeper) they typically mean perfect for every stat it uses.

I do this and it's just autism.

If you want a specific Hidden Power and perfect IVs you're going to need to do a LOT of breeding and checking.

HP isn't even particularly good, with its horrendously bad base damage. If you can get typing some other way, you're better off not bothering.