Not Dad, no. He doesn't need to use flasks, actually- he's got way better control of elemancy on his own. Ignis dug up some ancient text from the library back when I was still having trouble getting any magic going. I think he was tired of listening to me complain about it.

[Or more that Ignis was worried about his lack of progress and the disheartening result it had on him over time... he'd always been prone to bouts of depression and self-doubt, and Ignis liked to push his limits and encourage him to try different things to see what stuck. He had success with some things more than others- ways for Noctis to access his power was one he'd work hard for, especially after meeting Luna.]

There was a king generations back who had a similar problem as me- wasn't from a daemon attack, but he had less power than his older brother. When he became king, he had to step up, so I guess he did a bunch of research on charging items with elemental energy. Elemancy on weapons is what Specs got out of it, and flasks worked pretty well for me.