Fastest Way to Level Up in Yo-kai Watch 2

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Part 1

Requirements: Complete Main Story and defeated the final Boss. Have $234.

1. Go to The Fish Place in Uptown Springdale and purchase 73 Mackerels.
2. Take the Mackerels Jungle Hunter and trade them in for 1314 JP.
3. Purchase the Mem-o-Vac from Jungle Hunter for 1300 JP.
4. Go to Shoten Temple in Blossom Heights.
5. Fuse Flushback with Mem-o-Vac to obtain Vacuumory.
6. Go to Old Springdale.
7. Right outside the station, you will find a Baffle Board.
8. Summon Vacuumory to re-battle the final boss Dame Dedtimeto.
9. Defeat the final boss and you'll gain about 5000 EXP.

Part 2

Create 6 Smashibull Soul to purchase increase EXP gain.

Requirements: Rank S Yo-kai Watch and lots of money.

1. Go to Whatta Find in Shopper's Row at night.
2. Purchase Ethereal Water for $880.
3. Fuse Predictabull and Ethereal Water to create Smashibull.
4. Perform Soulcery on Smashibull to obtain Smashibull Soul.

At rank 1 equipping the Smashibull Soul gives 2% extra EXP gain from all sources. At rank 10 the Smashibull Soul gives 20% extra EXP gain.

You can equip 6 Smashibull Soul at a time for a total of 120% more EXP.

Part 3

Bring the Yo-kai Draggie to the final boss (Part 1) fight gives your party more EXP.

All of this (Part 2 and 3) turns the fight from 5000 EXP to about 12,000 EXP.

You can repeat the fight as often as you like, making it the best way to gain EXP in Yo-kai Watch 2.