Despite her immense power, there are several iconic villains who could potentially defeat G'iah, including Ultron, Apocalypse, and Galactus. Even with her multitude of powers, G'iah wouldn't stand a chance against formidable adversaries like Mephisto, Dormammu, and the Dark Phoenix.
Franklin Richards was omnipotent at some point, although his powers did not last forever. At the height of his powers, comic book Franklin Richards was much stronger than the MCU's Scarlet Witch ever was.
Scarlet Witch doesn't like to go all out with her powers too much but she'll definitely make an exception against the Hulk. He's just too dangerous for her to mess around with, so she'll do what she has to do take him out as quickly as possible.
Her full potential was not showcased until WandaVision. Scarlet Witch was by far the most powerful MCU Phase 4 character, yet Wanda could not beat Thanos in either Avengers: Infinity War or Avengers: Endgame.
Should he have a full Infinity Gauntlet, Thanos could have the foundations of the universe at his disposal. G'iah may have the speed as Thanos would be incapacitated from the Gauntlet's power, but that wouldn't last long as the Mad Titan has trained for carrying such power.
Cosmic Energy Manipulation: Enhanced by a sample of Carol Danvers' DNA in the Harvest, G'iah gained the power to manipulate cosmic energy, which allowed her to fly and direct strong energy beams towards her enemies. Flight: G'iah gained the power to fly thanks to Carol Danvers' DNA.
Given Marvel's history with understandable villains, it's safe to assume that the good Skrulls will support humanity no matter how badly they're treated and the bad Skrulls will dare to fight for themselves. G'iah appears to be one of the good ones, but she has an edge to her as well.
G'iah possesses the powers of several Avengers and other characters who shed blood at the Battle of Earth in Endgame. G'iah's Super-Skrull form makes her virtually invulnerable, with Asgardian genetics, a healing factor, magic, and various super strength variations, making her pretty much unbeatable.
Why didn't Giah die in Secret Invasion? In episode 3, it appeared that G'iah was shot dead by Gravik. However, the opening scenes of episode 4 reveal that, before those events took place, she subjected herself to the Super Skrull procedure, giving her the same healing powers as Gravik.
At the end of the finale, G'iah is recruited by senior MI6 agent Sonya Falsworth, which would seem to suggest that there are plans for the character in the Marvel Cinematic Universe down the line. Now, scooper MTTSH is claiming that G'iah will actually return as the leader of her own team of British-based heroes.
There are few beings who can defeat Galactus by themselves but Scarlet Witch is definitely one of them. Her ability to alter reality means that there's nothing he can do that would affect her and her friends.
With the Phoenix Force, Jean Grey is an Omega level mutant, meaning there is simply no limit to what she can accomplish, and though the Scarlet Witch would certainly put up a strong, mind-bending fight, Jean Grey would likely take the victory during this huge battle.
But the episode cuts to black quickly after the shot, so unlike with Maria Hill, we didn't see G'iah bleed out. And it turns out, Episode 4 picked up right where Episode 3 left off. It turns out, G'iah is alive.
G'iah now possesses DNA from at least 23 individuals, including Ghost, Captain Marvel, Black Panther, Captain America, Thanos, the Black Order, and Drax.
Later, Gravik gained even more powers derived from the DNA of the Avengers and other combatants of the Battle of Earth that were combined in the Harvest, wich he used it on himself and, unknowingly, on G'iah disguised as Nick Fury.
Unfortunately for Gravik, G'iah was the last Super Skrull standing and her set of abilities includes shape-shifting, telekinesis, super strength, flight, agility, durability, endurance, stamina, energy projection, heat and cold projection, empathic abilities, and almost all physical powers that the Avengers and Thanos' ...
And now that Gravik is no longer a threat, G'iah has now basically become the most powerful being there is — not just the most powerful Skrull, but also likely the most powerful being in the entirety of MCU.
Gravik's huge level of power in Secret Invasion has already proven that he is perhaps as strong as the Mad Titan Thanos, but there is one key detail that sets these two supervillains apart.
Wanda is famous for her “no more mutants” feat where she wiped out a majority of mutantkind after making a world where mutants were the majority of the world population. In the MCU, Scarlet Witch may put up a good fight, but Thor wins majority if not all of the fights.
It wasn't until she had possession of the Darkhold that she was able to realize the full extent of her abilities. Before Multiverse of Madness, she was strong but not that powerful. That's why the Infinity Stones-powered Thanos could withstand Wanda's attack in Wakanda and then defeat her and destroy Vision.
Scarlet Witch Wasn't At Full Power Until She Learned From The Darkhold. Both Infinity War and Endgame hinted at how powerful Wanda was and could still be. However, neither of those films, as well as none of Wanda's previous MCU appearances, had come close to showcasing Scarlet Witch's true power.
