Galactus is a cosmic entity who devours planets; Batman is a peak human with gadgets. This is not a contest.
This is one of the most extreme mismatches imaginable. Galactus is a cosmic entity who existed before the current universe and consumes entire planets for sustenance. Batman is a peak-human martial artist with advanced but fundamentally terrestrial technology.
Batman's preparation abilities are legendary โ he has contingency plans for the entire Justice League. But Galactus is beyond anything Batman has ever planned for. The Power Cosmic can manipulate matter at a molecular level, meaning Batman's gadgets, armor, and Batmobile could simply be unmade with a thought.
Even Batman's most powerful suits โ the Hellbat, Justice Buster โ were designed for specific DC threats with known weaknesses. Galactus has no weakness a peak human can exploit. This is a human trying to fight a force of nature.
Batman has found ways to fight godlike beings through preparation and tactical genius. His willpower and determination are unmatched, and he never accepts defeat regardless of the odds.
Galactus devours entire planets and manipulates reality at a cosmic scale. Batman has no weapon, gadget, or strategy that can affect a being of this magnitude. The Power Cosmic makes this a non-fight.
Galactus wins without effort or notice. Batman is the ultimate prepared fighter, but there is no amount of preparation that bridges the gap between peak human and cosmic entity.
Batman also fights
Galactus also fights