What is the fastest way to gain experience in Pokemon Mystery Dungeon: Blue Rescue team?

Question

By fastest I mean fastest in terms of experience gained/amount of real time spent.
EDIT: I have completed the main story and am currently in the post-game. I have also unlocked the option to change the team leader and have access to most legendary Pokemon.

Comments

What is your progress so I can find the best method

---

https://gamefaqs.gamespot.com/ds/929407-pokemon-mystery-dungeon-blue-rescue-team/faqs/79172/objective-level-grinding-suggestions here is a link to a guide. I did not make it so I will leave it as a comment

---

If you just want to level up and don't mind using joy seeds, this is probably the fastest way: https://www.youtube.com/watch?v=jImNyd4X-WE
(you should recruit raikou first/bring an escape orb to make it out safely)