Cheapest Boss Attack(s) in the series?

[AquaTeamV3]

What are, in your opinion, the cheapest attacks you've seen in a Megaman game?  For me, I'd have to say that most of them come from Network Transmission; some of the attacks were unavoidable.

Protoman EXE's Surprise Slash~Network Transmission

Very cheap tactic; Protoman dissapears and gets directly next to you, immediately doing a wide slash.  It's literally unavoidable; jumping or sliding will not save you.  Without a barrier or Invis chip, you're done for.

Zero.EXE's double wave~Network Transmission

Zero fires a double slash wave, similar to the ones fired by Double and Fenri LunaEdge.  My question is, how does Megaman avoid this if he can't wall jump.  Guess what, he can't.

Tornadoes~Air Man

I never did like this move.  Over the years, I've gotten exceedingly better at dodging these, but it's still an annoying move.  The fact that wind is blowing makes it all the harder to jump over, and he does them in volleys too.  And people wonder why that song is so popular.

There's some more, but I can't remember exactly what they were at the moment.

[Tickle Buffalo]

That stupid phoenix's A/S rank attack from Zero 2. Going invincible for extended periods of time is not fair or fun. Doing it when the game locks content if you get a low rank from taking too long is even less fair. It's not even hard to avoid, it's just annoying. Screw that guy.

[Acid]

The most annoying thing I ever encountered were those silly invincibility/power up/speed up phases in MMX3.

[Satoryu]

Wily Capsule's elemental balls attack in MM7. moreso the fire and ice ones.

anything Snipe Anteater shoots at you.

Armadillo's ability to deflect the Hadoken in MHX.

[Solar]

Wily Capsule's elemental balls attack in MM7. moreso the fire and ice ones.

^This

Also:
-King Jet's attack that destroys the platforms.
-Leaf Shield + the falling leaves
-Airman's, there some times were it just can't be dodged.

[Da Dood]

Most are covered, but I hate Mino Magnus' body split too. I picked him first in my 100P Ragnarok attempts because of it.

[Protoman Blues]

BubbleMan.EXE. 

EASILY BUBBLEMAN.EXE!

[Alice in Entropy]

Let's see...

- NebulaGray's leaping dragon attack that cracks ALL THE FREAKING PANELS (AirShoes are a MUST here).
- Elec Beam. Three hits and YOU'RE TOAST.
- Scorch Wheel. I've always found it tough to dodge.
- ANYTHING from Duo.EXE.
- Super Model W Serpent's explosive crystal bullets and fireballs. I really hate trying to dodge them.

BubbleMan.EXE is indeed a very tricky fellow. *Has bad memories of trying ad nauseum to beat him*

[Solar]

BubbleMan.EXE. 

EASILY BUBBLEMAN.EXE!

HOW THE [tornado fang] COULD I FORGET THAT COWARD! o_O

[Pringer X]

Snipe Anteater---just the biggest douche in the world. I could barely even hit the bastard because he'd twirl around more than a ballerina on crack and caffeine.

[Klavier Gavin]

BubbleMan.EXE. 

EASILY BUBBLEMAN.EXE!

^This.

[Satoryu]

in Powered Up, there's nothing you can do when Wily starts using Rolling Cutter.

oh, and Fire Man in MM1 is an absolute [lightning web]. the fire blasts are alright, but the flares left on the ground are the real problem.

[AquaTeamV3]

BubbleMan.EXE. 

EASILY BUBBLEMAN.EXE!

You gotta hate bosses who fill the screen with their projectiles.  Then he has to go toss crabs at you; let alone the fa t that some bubble contain fish or mines.  The truly annoying part is the fact that you can only encounter his V3 form when your heath is below 25%.  Jerk.

That said, I find Infinity Mijinion annoying for the same reason; filling up the screen with bubbles.  Why did they have to go and nerf the Falcon Armor's charge shot?

[Acrosurge]

It doesn't get much cheaper than Awakened Zero's ultimate attack in X5.  Not only do his giant saber waves cover the screen, but they are also instant kill moves and Zero is completely invincible afterward.  He's not hard, due to the fact that Zero never pulls out this move at the start, but the move is uber-cheap.  Hmm; I can't recall any other boss that has instant-kill moves that don't involve spikes.

Ninetails's Annihilator Hadouken and MM7 Wily's fire and ice spheres come in second.

[Flame]

Colonels cape throw attack in exe 6. he throws his cape at you and if it catches you, he does a slash that reduces you to 1 HP no matter how much HP you have.

[MassKiller1]

If you ever get hit by it and it's impossible to get out of if you do...

Omega's 9 hit combo...

I really hate him when he does that because I usually play Hard Mode in Rockman ZX and I know the minute he touches me with that I'm screwed over....

[Acrosurge]

Colonels cape throw attack in exe 6. he throws his cape at you and if it catches you, he does a slash that reduces you to 1 HP no matter how much HP you have.

Which reminds me that Epsilon's Metacrush is unavoidable and also reduces his target's HP to 1 regardless of that character's level.  I don't even know what Epsilon does after reeling in his opponent with this move, but it lays an uber hurtin'.

[White-Jet]

That said, I find Infinity Mijinion annoying for the same reason; filling up the screen with bubbles.  Why did they have to go and nerf the Falcon Armor's charge shot?

Let's also not forget the annoying doppelganger that emerges after hitting him with ANYTHING!!!  And they all just stand in wherever you whooped him and throw more bubbles out of their heads to the point where you're too busy wailing on them than Infinity himself!    He's the reason I go after him first when I have to re-fight the Mavericks again before facing Sigma.

[Flame]

I cant fight him without armor.

[Gaia]

Gigavolt Man-o'-War was annoying, one slip off the platform by mistake would kill you. (I hate his VA also, annoyin')

The Exploder enemy from Command Mission, just wasn't fair... In fact, his random encounters weren't fair either, he was mostly paired with others. (Kill him before he kills you. X Heart is a MUST HAVE against this guy)

That six-armed bastard kept chaning elements, wich was annoyin', since his weaknesses kept changin'

Infinity Mijion for same reasons above

Bubble Man EXE for same reason as Mijion

What everyone else has said

.. Boy, took a lot of practice against those guys.

[Flame]

oh bah. Meltdown was easy. just wail on him with hyper modes.

[Gaia]

oh bah. Meltdown was easy. just wail on him with hyper modes.

Unless you want to take the hard way, no Hyper Modes for the entire speedrun. (I used to run from Meltdown before I figured out his weakness)

[Flame]

hes still easy. but then, My Zero has Red lotus saber and heat haze X2...

[Gaia]

hes still easy. but then, My Zero has Red lotus saber and heat haze X2...

Other than that the six-armed bastard kept chaning elements, wich was annoyin'. (I'll replace Meldown with that six-armed turd)

[Duke87]

X5 Sigma. Giant [tornado fang]ing purple blocks.