Level 25

This stage has Electrex as a miniboss. He has about the same stats as the Terror Dactyl boss on Level 20.

Strategy
From the above paragraph, you may think that this boss will be annoying, but in reality it is very easy. He has an unpleasantly low amount of damage and no status effects, so taking him out should be easy. Use Freetle to burn him and Firetaur to destroy him.