This is how the Matchup goes:
As soon as the battle starts Mewtwo invokes a gravity field arround him, where this gravity field is as strong as it can be, because it is a canon match.
Samus then starts shooting her lasers/beams to mewtwo, in the sequence: "Ice laser/Light/Plasma/Dark/Light+Dark(forgot name)/Nova.
Ice as soon as it reaches mewtwos gravity field falls on the ground, being nullified.
Light is affected by gravity too, so it falls.
Plasma falls into ground too.
The anti-mater, even as it seems "invincible", it is affected by gravity, as it has its own gravity field. Meaning if a stronger gravity(mewtwo force field) acts on it, it will fail, thefore it wont hit mewtwo.
Light + Dark, just the result posted.
Nova: O this one is tricky, but i figured it out. People keep saying "HAHAHA, in the games the nightmare boss want able to stop this one, so this one > mewtwo", but even, people dont know what this is made off.
First point: They say in the game it isnt affected by the "Strong gravity force" applied by nightmare. whereas in the game, they refer to it as "Very strong gravity", and not to "MAXIMUM POSSIBLE GRAVITY", meaning that there is a strogner gravity, and maybe it can pull the beam down.
Second point: The shot, what is it made of? No one knows. Therefore we can assume it is anything, so it may or may not be affected by gravity. BUT, what kinda of "thing" is not affected by gravity? Even the FASTEST thing know in the universe is affected by it? So how is it possible something has
1. MORE MASS then the gravity user(in this case it cant because we assume mewtwo is using maximum gravity possible), or
2. It is faster then light WITCH isnt possible as in the game you can see the projectile travelling, meaning it is slowert than say, a bullet.
Conclusion: Nova beam is suceptible to gravity, so, it wotn hurt mewtwo then.
After samus sees her shots fail, she tries missles, wich will fail to gravity too.
Her last resort then is going melee with her screw attack.
Mewtwo, seeing he has no chance on melee fight, he teleports to far away from samus everytime she approaches, and if she shoots, he uses his gravity field, THE CICLE WILL REPEAT UNTIL the infinte.
Therefore this battle is a Tie.