This depends on what you mean by a boss fight. What kind of boss fight? It would really help if you could post your project link here as well so that we know what your game is like.

legendary34678 wrote:

This depends on what you mean by a boss fight. What kind of boss fight? It would really help if you could post your project link here as well so that we know what your game is like.

something like this video right here: https://youtu.be/rilZ285QkFA
but 2d

so basically if you want us to help then you should be more specific than “making cool stuff”. something cool might be like a sonic boom or a explosion but for example if you only want explosions then we can help you more

and if you want to be specific you can for example list out a type of explosion (like purple with fireworklike effects)

The scratch wiki has a article on making a simple bossfight https://en.scratch-wiki.info/wiki/Creating_a_Final_Boss_Sprite
but I don't know if it would help