>>23420693
No. I checked the JP wiki and it very much is a carry over glitch and an easily exploitable one at that.
1. Learn a skill
2. Unlearn (that is deactivate) that skill
3. For some baffling reason, they treat that PP as earned PP for NG+ inheritance
If you're the type of person who swaps skills around like crazy based on need for a particular map, you can make massive amounts of PP.

That would explain why Masaki/Lune/Mio have so much PP despite me going down Shutedonias and Lemia's totals practically tripling.