Mega Man Xtreme/Computer Core, stage 3

Walkthrough
The stage itself is very short, and consists of a vertical passage. At the top of it, X will find himself in the Teleport System.

Teleport System
Use the Hadou-ken and the Shouryu-ken against Storm Eagle.

After you defeat them all, you'll be teleported to a corridor where you can recharge your special weapons.

Maverick: Sigma
This is Sigma form from Mega Man X1.

Sigma is the only boss weak against the Electric Spark. Other weapons are equally effective against him, too.