Seems like a good plan to him. Even if he doesn't quite understand the logic of trying to punch a blob. The grimer looks between the two - the easy target of the fairy type perched on Duke, and the ranger who was taunting it...

Then falls for the taunt and starts oozing toward her. Congratulations!

There's a quiet "ha!" from Duke. He has found some damaged nails. These, he can work with.