Alright, XWing. I will edit this post with a video of it as soon as I can.
EDIT: Daaaamn okay, so this isn’t perfect, because I died within one or two shots of killing him, but my hands are shaking from fatigue. I haven’t played MMX on keyboard in years. I’ll make a better one later, but this should be proof enough for now. Here’s the entire final boss sequence with nothing:
http://www.rpgclassics.com/staff/SG/megamanx2.zm4
Overall, the X2 final boss sequence is probably the easiest to do with nothing. Zero is braindead easy to beat, and you can run circles around wolvie Sigma. The Wireframe Sigma isn’t even that difficult; the only problem is that near the end, he does that teleport move, and if he teleports right on top of you, he holds you in place and you have no choice but to be hit. It’s easy enough to dodge, but if you mess up, there’s a high probability that it will one-shot you.
X3 is probably tied; Sigma’s final form is very easy in X3 (although it’s intimidating that it can kill you in two hits at first), but the Captain America Sigma (his first form) is a little hard.
X5 is easily the hardest - Sigma uses this absolutely ridiculous desperation attack that can kill you in two hits, and if you’re not standing in a good spot when it starts, you’ll very likely get hit twice very quickly.
X4 is the next hardest; the first two forms are actually a breeze, but the last form has so many attacks that are very hard to dodge, and it has so many variations of each attack. So, you have to know how to deal with all of said variations, and be able to react to any one that he does. I suppose that’s to be expected - I would say that X4 Sigma is the hardest one if you play the game normally.
X1 is a total bitch, because there’s so much time during the fight where you’re not even attacking, just dodging. When you have to be on the defense for so long, you’re bound to take a lot of hits, so you have to be real slippery.
X8 is not incredibly hard. The final boss’s second form is what does it. It’s very hard to avoid being hit by that form’s attacks. The final form is actually not too hard - the problem is, when you get to it with low life (and you probably will) you’re bound to screw up something during the final form, and it will only take one hit to finish you.
So, if I had to rank them in order of difficulty, I’d say
(X6 & X7, because they’re impossible)
X5
X4
X1
X8
X2
X3
X6 and X7 are literally impossible to beat with nothing; X6 has a lot of levels that are impossible to complete without an air dash, and X7 forces you to get life ups (I was looking forward to trying X7, too, just because of how absurd it is).
You’re thinking of X5, and unfortunately, I never beat that one with ‘nothing’. I’m sure I could, but it sucks to lose to that boss because you have to do the entire level again, and it’s too boring. I’ve gotten Sigma within one FUCKING shot of dying though, many times.
But yeah, X1-4 (X only), X8, and almost X5, with ‘nothing’. I put ‘nothing’ in quotations because there are a few spots where you have to use ‘something’:
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X1 forces you to get the dash and gun enhancement, and as I recall, only fully-charged shots from the X Buster can damage Sigma in his final form, so technically, you have to use the gun enhancement.
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In X4, Sigma’s first form can’t be damaged by the X Buster; you have to use the fire gun.
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In X8 with Zero, he eventually gets an upgrade from a boss that makes his saber eat projectiles; one of the bosses also becomes weak to his saber attack, too).