Either call his pal Aquaman or use convenient Bat-Godzilla Repellent he had on his belt.
Godzilla is stomping through the Atlantic Ocean towards the USA. In 72 hours he makes landfall in Gotham city...
>Hot Wailord on Skitty Action
There is a rumor that Adam West Batman was gonna have a crossover movie with Godzilla but it never fell through.
>Realistically
Dude they're both fictional characters that couldn't exist in real life, OP just wanted to see a cool scenario play out.
Pick up the bat phone, call Superman to pull in a favor. About 10 minutes later we have jimmy olsen getting ready to go kaiju.
He gets into a giant Bat Mecha and fights him. But during the fight realizes Godzilla is being mind controlled to be bad. With the help of some of the Batfamily, they manage to get Godzilla free from the evil aliens. But the aliens have a trump card and send two monsters: King Ghidorah and a OC one. Batman and Godzilla team up to defeat the monsters. Godzilla swims off into the sunset as Batman waves goodbye.
THE END
I mean even comic book batman couldn't do shit, its motherfucking Godzilla. He wouldn't even notice him.
Call Superman who KOs big G after a long hilarious fight
Godzilla is about to kill Batman when Bruce says “Martha”. Godzilla consfuses his words for “Mothra” and spares his life.
Don't worry guys, I've faced something like this before and I know *just* how to solve it