Mega Man X8 Walkthrough

Dynasty: Gigabolt Man-O-War
This stage is all about chasing Gigabolt Man-O-War(who is in a UFO form)through a futuristic city while on a floating Ride Chaser. During the stage, you'll encounter glowing billboards. Don't hit them, as you'll lose speed. Instead, let Gigabolt hit them. The billboards will collapse if he hits them.

Gateway: Sigma
From the hangar bay, head right and enter the doors. You'll find a huge gold structure with teleporters on it. Here are the colors of them and where you'll find each Maverick(after you defeat them, you'll find out that they were fakes): After you defeat them all, you'll have to evacuate. Return the way you came, watching out for the crumbling floor. But when you reach the hangar bay, Sigma will appear. He'll talk a bit, then attack. Sigma has many attacks. One is Sigma Slash, where he'll do a dash slash.
 * Black: Dark Mantis
 * Red: Burn Rooster
 * Orange: Earthrock Trilobyte
 * Purple: Gravity Antonion
 * White: Avalanche Yeti
 * Cyan: Gigabolt Man-O-War
 * Yellow: Optic Sunflower
 * Green: Bamboo Pandamonium