Metroid Fusion/Bosses

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Arachnus/Morph Ball Guardian

As soon as it takes its form, pump missiles into its belly. If it scratches the air twice, be warned, because it's about to shoot a wave of energy at you, which does moderate damage. If it screams, jump onto a ledge nearby to dodge the fire. Once it's in its ball mode, you can hurt it, so use a ledge to jump over it from high above. If it hits the wall you're clinging to, you'll fall and take damage. Simply repeat the process to make it transform back into a Core-X.

This part is fairly easy. If you ran out of missiles, grab the green X floating around, then hit the Core-X with a missile whenever it isn't flashing. Dodging it shouldn't be hard. Three missiles will finish it off easy, and now you have the morph ball!

Charge Beam Guardian

This fight is really just practice for the tougher Core-X form. All you have to do is keep from getting hit. When it is charging up to fire, it will open an "eye" - shoot it with a missile then jump away immediately to avoid the blast. A few hits will do it. Once it's dead, grab the giant X for the charge beam ability.

Pogo/High Jump Guardian

To defeat this boss, you will need to dodge it until it opens its mouth and floats down slowly. Then, shoot as many missiles as you can into it, and run away. If you get stuck, bomb your way out. The Core-X is almost the same as with the Morph Ball Guardian, just a bit stronger and tougher.

Serris/Speed Boost Guardian

This boss is Serris, who was infected and killed by an X parasite who took over its form. One of the more dangerous bosses, it moves quickly and inflicts great damage. Shoot its head with a missile or charged beam, then quick;y jump out of the way. When the boss is flashing, he moves considerably faster than usual and is invincible to attacks. It may be hard to hit him, but watch his actions, dodge, and when you see him come at you, unload. The ladders to the left and right and on the ceiling are useful to dodge attacks. You can avoid virtually all of Serris' attacks by staying at the very top of the right ladder to make an easy (and boring!) fight.

The Core-X is better fought on land than underwater, since you can move more quickly up there.

B.O.X. Security Robot

Unfortunately, this boss will not give you any power-ups, since it's not X-infected. Hang onto the ceiling, and wait for it to come under you, then shoot. Its attacks include jumping at you and releasing a ball that opens a pillar of fire in both directions. When it lowers, move to the other side, since it comes back up before disappearing. Around 10-12 hits will make the robot go off to the side and create a passageway for you to follow.

Varia Suit Guardian

The Core-X who stole the Varia Suit became much bigger. Missiles are useless here, so charge your beam and wait for it to go in your firing range. Make sure not to fall into the water, since that slows you down tremendously. After it changes color, hit it a few more times, and defeat the Core-X to claim what you deserve.

Wide Beam Guardian

He may look like a scientist, but don't be fooled. This is another Core-X, similar to the one fought when getting the Charge Beam. To get it to change, though, shoot a few missiles at it. Remember you have limited time, so hurry up. After retrieving the Wide Beam, step onto the controls to cool down the heating unit and stop destruction.

Arachni-X/Space Jump Guardian

This boss starts in a very tall shaft-shaped room and fire comes from the area above to the corners and middle of the room. Then a big blue and red spider appears and moves around and can pick you up and do a sort of seismic toss. A little after its fire goes out, fire your missiles until it closes its mouth again. Once you hit it enough it will lose its legs and flip in mid-air. Shoot it when it is spitting little wads out of its mouth, then shoot missles at the flying X.