LogFAQs > #882529575

So this fight is very simple. On one end, you have a bunch of squishy Persona users, and a highly boosted Bass who is absolutely no joke. On the other end, you have the Mega Men. Short summary for each of them:

-MM Classic: Needs no introduction. Huge weapon array, fortress-disabling mega buster, the works. Most important thing is that he DOES have access to his super moves here, including Hyper Mega Man, which makes him giant for a moment for a massive beam attack.
-MMX: Has access to Giga Attacks (massive power blasts and energy tackles surrounded by an enormous power aura) and can use his insanely powerful Ultimate Armor and X-Fire modes, which kit him out with super high-end weaponry, like so: https://youtu.be/wADxnxqMOE4?t=2547 (that's the ultimate boss getting chunked out by a third of his health in a flash, BTW)
-MegaMan.EXE: Has healing, shields, buff stripping, can halve enemy damage or double enemy damage taken via his Dark and Holy Fields, can edit terrains, and most of all, has access to Program Advanceds. These are super attacks that combine multiple chips to create a single much more powerful effect - several sword chips transforming into a massive sword wave, for example. Defeated the canonical Bass.EXE, obviously, meaning he knows what to expect from him, more or less. Easily the most flexible of the Mega Men, capable of adapting on the go.
-Mega Man Volnutt: The simplest of the Mega Men. He has more classic 'gunner' ordnance instead of strange tools, such as homing missiles, a big laser cannon, a defensive shield forcefield, among others. Absolutely no gimmicks - probably has the hardest to dodge attacks out of them all for this reason.
-Geo Stelar: The sleeper Mega Man you've never heard of. Can turn invisible, teleport, and possesses massive physical force, as well as use his Noise Change abilities to assume varied forms with all sorts of elemental attacks, defensive capabilities, regeneration, debuffing and more. He survived entering an EM Wave black hole and defeated its master, who was about to consume earth with its power.

Now, the thing to remember here is...this terrain is unbelievably treacherous. It's the entire MM2 Wily Fortress, and that means that it's a bitch and a half to navigate. Here, Mega Man, X and friends have a chance to find the perfect chokepoint (say, a place with lots of dangerous, tricky platforming) and park there, then explode the enemy team with an absolute barrage of hi-tech firepower when they show their faces. It's likely Bass will survive...but no one else can take it, not even close. Rikku? Kirby? Yu? Link? Duke? None of these guys are built to withstand the firepower of the Mega Legends. And with both Geo and MM.EXE having the tools to counter his buffs and bring Bass to normal, defeating him will be a difficult, but by no means impossible task. At that point, the rest is mere clean-up duty.
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Shine on, you crazy diamond.