Fossil Cave
I can't tell if this guy was intentionally easy or if using Tatto was cheesing it.
Hot Springs
This guy is even easier than the last guy. It helps if you have the Dyno Cane.
Deviant Den
Panic Peak
Using the boomerang, you can do 9 damage per pass. Plus, Mail's running speed is better for avoiding the falling stalactites. It's really annoying when this guy has to walk away from you, though. Why is he so slow?