Ribops

Ribops (リボプス) is an enemy from Popla Cocapetri's stage in Mega Man Zero 4. Ribops is actually a giant building and security system.

Strategy
The fastest, and most common way to destroy this "miniboss" is simply by using the Zero Knuckle - it will pluck all the key cards in one attack, making this sub boss the easiest of the eight. One could also use the Z-Saber EX Skills or the Buster Shot, although it takes much more time to beat, unless the player wishes to do so.

It is divided into two sections, the top, middle and bottom layer. Destroying the final key from either layer will determine the path the player will take. Of course, to make things more harder, there are Bonsects and Triaformers to ambush Zero on his way.