Guys, I just wanna bring up to you some interesting use of PKT that I've been utilizing lately.
I've been using PKT as an indirect replacement to uair, useful in situations where opponents would choose to challenge you from above as opposed to just dodging you.
As great as uair is, it doesn't have the best range, and it can be beaten out by certain dairs (Villager, Mario, G&W, etc.)
But what I've noticed is that PKT's early hitbox (right when it comes out) is transcendent. It'll go through even 3 of Villager's turnips. So instead of jumping up and uairing, use PKT at a close range (keep that startup in mind though, time it a bit earlier!). It'll pierce the opponent for 9%, beating out their dair, and you can still loop PKT around for either a PKT2 read or an escape option.
Of course, it's not always the best option, so use with moderation, but I think it's a nice option against people who challenge you from above. Just make sure you don't get the later hitbox of PKT since that'll get eaten by any attack.