Gate of Memories
Go the arena and win F-Class.
Head to the Gate of Memories. That would be the Gate on the left in the right door. I'd reccomend: Healer, SkyDragon, and Dragon (or Anteater).
Train your monsters until their levels are 7+. SkyDragon's level can be a little lower, since he is good no matter what level, and you just got him. Seriously, he was better than my level 8 Anteater when he was level 6.
Fight MadCat. He has LegSweep, VacuSlash, and SquallHit. LegSweep will trip one of your monsters and make it lose its next turn. VacuSlash is just a kind of slash, does about 15 damage. SquallHit lets MadCat attack first with his regular attack.
MadCat is average. If you want a FangSlime, breed any kind of Slime (don't use Slib please) with MadCat.
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