You'll initially encounter Kelolons in a tutorial battle shortly after arriving at the Ipsilon Mountains, where it will take you a couple of hits to kill them. But even after you level only a single time, they'll drop in one hit. Once you pick up Jansen's ground spell from a pot in the area, that will work to quickly send them packing as well. If three of them are left alone, they'll occasionally combine their turns and hit you with one stronger attack called "Combination attack". They shouldn't last long enough for this to happen though.

Weak Against Earth

HP- 80

Encountered- Ipsilon Mountains