Basic Trope: The Final Boss is defeated in a cutscene.
Straight: In Tales of Troperia, Bob fights his way through a castle, slashing through hundreds of mooks, and finally reaches the lair of Sir Evil. Instead of a typical battle, the game shows a cutscene of Bob throwing his sword and slaying Lord Evil.
Exaggerated: Every single battle Bob gets into, even against minor mooks, plays out in a cutscene.
Bob whittles Sir Evil down to a certain health level in gameplay, then must use a Quick Time Event sequence to finish him off.
Double Subverted: The real battle lasts for a few moments with nothing happening, then goes back to a cutscene of Bob defeating Sir Evil.
Parodied: The gameplay engine (or the cutscene itself) depicts Sir Evil showing Bob a video of how the battle would play out in a cutscene; then Sir Evil keels over defeated.
Zig Zagged: Bob fights the boss as usually, but after bringing HP to zero, a cutscene plays him finishing the boss... just to revealed that boss still has two more forms, which are fought in traditional way aside from the finishing part where Bob deals a final blow for both formes in a cutscene.
Averted: Bob doesn't defeat any bosses in a cutscene.
Enforced: The creators had a cool way to kill off the villain that can't be achieved with the usual game mechanics.