NPC quests is good, but what else?
A beautiful gal <3 Trick or Treat @ Redwolflake15
probably the wrong place for this
reselling ^^ i used to do this until i got lazy and now im broke like a joke

Selling expensive items like boosters, amulets, and holiday-themed items can make you rich. It takes a few months to accumulate the amulets and boosters but it's worth it in the long run.
[tot=PiplupMagby34]
quests are the easiest/quickest way IMO, but restocking is p easy here, i would start at the food shop for beginners, almost anything in there sells way higher in user shops than in the shop itself.
[tot=Chey]
If you can purchase cash shop credits you can resell them for a nice amount of sP in form of gift cards.
Apart from that just save and don't spend your money on clothes or whatever until you have reached your goal.
Charge a fortune to Darkside refugees trying to get into Centropollis. They will give you their first born for a free pass in a makeshift boat and a lifejacket. Rinse repeat
My forum title is proof the technique works. Don't listen to peasants who will suggest you go play fetch for a bunch of lazy NPCs.
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