Garudoriten

The Garudoriten (ガルドリテン) is the boss of the Lake Jyun Sub-Gate. This Reaverbot is the guardian on the Red Refractor which is needed to power the Flutter. It can tuck its appendages into its yellow, cylindrical body for protection or disguise. It can attack by diving head first into its target and then jumping back and creating a shockwave. The only part of its body that is vulnerable is its head. The rest of it is covered with armor.

Trivia

 * It's believed Garudoriten's name and appearance are based on Gold Lightan (ゴールドライタン Gōrudo Raitan), the main character of the anime Golden Warrior Gold Lightan. Coincidently, Gold Lightan and Mega Man Volnutt appear in the fighting game Tatsunoko vs. Capcom.
 * Garudoriten is called "Galdulton" in the Rockman DASH Original Soundtrack.