Shorten runtime of this Python program
Specific suggestions


Using command-line arguments is the idiomatic way to collect input. This makes the code scriptable and reusable as a library.
The idiomatic way to run main is this:

if __name__ == "__main__":
    main()

Several bits of code are duplicated, such as min(teamG_beybladePowers). Pull those out into variables to avoid re-iterating through the whole list more than necessary.


Tool support suggestions


black can automatically format your code to be more idiomatic. It'll do things like adjusting the vertical and horizontal spacing, while keeping the functionality of the code unchanged. In your case the code does look decently formatted, so it may not change much (or at all).
flake8 can give you hints to write idiomatic Python. I would start with this configuration:

[flake8]
max-complexity = 4
ignore = W503,E203