Sure! Here's an example of a single HTML file containing JavaScript code for a simplified 3D fighting game resembling Super Smash Bros Ultimate:
Please note that this code merely provides a basic structure for the game and includes a simple representation of two characters on the canvas. Actual game logic, character movement, combat mechanics, and interactions with the user would require more extensive coding. Also, this example does not use pictograms for characters but uses simple colored rectangles for demonstration purposes. Feel free to further enhance and build upon this template to create a complete game.