I won't be precise, but here I go.
18-23 - Zombie, Horny mushrooms
23-27 - A bit more of them but mainly Evan quests
27-30 - Sand Rats, Scorpions.
30-35 - Mushroom Kingdom. We gotta save the princess.
35-37 - Cold Eyes and Pepes. Some cats.
Of course, I got a lot of my experience from Evan quests. Now I'm a little confused on where to train but I'm thinking of doing KFT and Ludi quests and a little carnival but I'd rather not do carnival. I'll probably try cold eyes and pepes again.