That would depend on if you mean the arcades with the new types of games or if you mean the old ones like Pacman or Space Invaders.
The old types of arcades have almost all but disappeared and you probably won't be able to find one just wandering around Tokyo. I live in Tokyo but I don't even know where to find one. But the new modern type of arcades can be found just about anywhere near large stations.
Maybe this website will helpful.
https://en.compathy.net/magazine/2016/07/09/the-10-best-japanese-arcades-in-tokyo/