How would guns work against Samus's fully upgraded suit that takes little to no damage from nukes? Sonic has dodged several bullets from enemies in the intro to Sonic Unleashed. Furthermore, he moves at hypersonic speeds to lightspeed which means he's several times faster than the bullets. Ness has telekinesis to block the bullets and Shulk has dodged a rifle round. Other characters have magic armor, invulnerability, whatnot so bullets are useless.

That's cool and all, but the Triforce and Monado can kill immortals or give immortality back.

You do know that immortality isn't the reason why they can take so much hits, it's the fact that they're really durable due to either technology, hard flesh, or probably magic. Taking away immortality is useless since it doesn't get rid of their durability the only ones here with immortality is Rosalina, Pit, Palutena, Dark Pit, and Ganondorf. Shulk can just give himself immortality again. Also, Kratos had to impale Ares with the blade of the gods to take away his immortality. Nintendo characters are either to fast or durable to be impaled. Zeus had to use the blade of olympus to drain Kratos' immortality, which Nintendo characters aren't going to touch because they already have their preferred fighting style. Furthermore, taking away some characters immortality won't take away their powers.

Again, bullets will do nothing.

Could all those powers prevent Samus from being defeated by Mario in any SSB game? Well if Mario can easily beat Samus in any SSB game, your argument really becomes weak.

Mario casually and easily dropkicks castles in Super Mario World and faces a gorilla that's able to easily punch the moon down to earth. Mario is clearly stronger than Kratos who struggles against Atlas's two fingers.

https://www.youtube.com/watch?v=tc0OyYPXics#t=262

Also, Samus isn't fully upgraded in the super smash bros otherwise, the game wouldn't be too fair. Same for Shulk, Sonic, and other characters.

Let's talk about Pikachu.

Pikachu has fairly modest base stats, but a terrific movepool. According to one of its Pokedex entries, "When it releases pent-up energy in a burst, the electric power is equal to a lightning bolt." This is fitting, as two of Pikachu's most potent attacks are called "Thunderbolt" and "Thunder." In addition, Pikachu (along with its evolutionary family) is the only Pokemon capable of learning the extremely powerful attack Volt Tackle, which causes damage to the user as well as the target. All three of these attacks have a chance of paralyzing the target, which reduces their speed by 75% and sometimes renders them completely immobile.

Pikachu can also have the ability Static, which has a 30% chance of paralyzing any opponent who makes contact with it. The alternative to this ability is Lightning Rod, which absorbs electricity-based attacks, rendering them entirely ineffective on Pikachu and in fact boosting his special attack power by 50% with each attack absorbed. A Pikachu with Lightning Rod would make an extremely entertaining opponent for Cole MacGrath! Each could pelt the other with electric attacks of catastrophic power without end, neither making any progress and both actually powering up their opponent. Thankfully, Cole has Ice- or Fire-based attacks he can fall back on, and Pikachu can learn a handful of strong attacks of other types, such as the Steel-type Iron Tail.

But wait, there's more. When holding a Light Ball, a special item even wild Pikachu are sometimes found carrying, Pikachu's attack stats are doubled. Those Thunder strikes will pack quite a punch now, to say nothing of Volt Tackle.

And in case you think you can outspeed Pikachu, well, maybe you're right. Pikachu's base speed is a respectable 90, on-par with Lucario's. However, Pikachu learns the useful psychic move Agility. A single use of this doubles its speed, while it can use the move up to three times to quadruple its base speed. I doubt that will be necessary, though, as merely doubling its speed makes Pikachu faster than the fastest Pokemon to date, Deoxys in its Speed Forme. For reference, Ninjask, a 2-foot-tall, 25-pound flying bug that is a bit slower than Deoxys in Speed Forme, is said to fly so fast that it is invisible to the naked eye.

So, to recap: With a single setup move, Pikachu is so fast it is invisible. It can strike from afar with (double) the power of a lightning bolt, or get in close with a strong melee attack. It can cripple its opponents' speed or even render them immobile with most of its attacks. It is immune to electric attacks and absorbs them to grow more powerful (why hello there Zeus, you're looking a little bit nervous).

Pikachu is Samus-tier broken. And it's so relatively weak compared to other Pokemon (*cough* Lucario) that it's not even considered competitively viable. But competitively viable and canonically powerful don't necessarily go hand-in-hand. If we take a look at what Pikachu has managed to accomplish in any of its non-video game appearances, it has an impressive resume which includes taking down several legendary (essentially demi-godly) Pokemon.

I felt compelled to write this bit up because I suddenly really thought about Pikachu and realized that it was being grossly underappreciated here. Most people look at it and see a cute little stuffed animal, which is exactly what Nintendo wants you to see. But in actuality, Pikachu could fully incapacitate most characters on either of these rosters at the speed of light. ...There wouldn't be much left of them, either.

Smash Bros (as is the nature of fighting games) obviously adjusts the power levels in an attempt to 'balance' the roster. All-Stars is no different. If you want to compare the two rosters in terms of their fighting game abilities, it will be a draw, because the roster will be balanced.

That's boring. It makes more sense to compare them in terms of their canonical powers from their own games. Or does Kratos really have such a hard time defeating Fat Princess and Parappa?

Another reason I don't support using their Smash/All-Star appearances as references is because these games tend to give their characters strange abilities for the sake of broadening their moveset. Something like Link's final smash has no direct relationship to anything he does in his own games. Of course we'll make an exception for characters who have little or nothing to draw upon from their actual series (such as Captain Falcon), but for most I think it's more reasonable to consider their canonical appearances instead.

Well Kratos could just ambush Samus when she isn't looking, and use the Blade of Olympus to cut that suit open like a sardine box.

And the same for Sonic, plenty of times he can be ambushed by Nathan drake stealth choked to death.

Telekinesis & dodging speed & powers have no use in an ambush where you can be killed before you can assess the situation.

We have Sly & Raiden who can both sneak and ambush the fast ones, pick them off 1 by 1 killing them with a quick throatslice or a gunshot, and then those who have immortality, as i mentioned zeus can take on the immortal ones.

Then when the immortal ones lost their immortality, we scatter back, probably lose 1 or 2 but its a trade -off for taking out the everyone except the immortal ones.

Then we ambush the last couple in the same manner.

Hide in the dark, use guerilla tactics as ours have been trained in combat isntead of just powers, we use tactics.

Show them the Art of War.

Simple as that.

So Melee beat PSAS, so you're giving them a larger roster? That just makes it an even bigger landslide!

When did that happen?

When the author of the thread decided it to be so, and changed the roster.

When did the bolded happen?