The Final Boss Fight & Game Ending in Dragon Ball FighterZ. There are 3 Story Arcs in total (each one has 9 Chapters).

The game ends after Story Arc 3. In total there are 45 maps in the game.

Story Arc #1 = 9 Chapters, 15 Maps
Story Arc #2 = 9 Chapters, 13 Maps
Story Arc #3 = 9 Chapters, 17 Maps

After beating the game for the first time you also unlock "Hard Mode". So you can start a new game in each Arc to fight higher level enemies and earn better skill rewards.

For the final boss, simply keep spamming the Square-Button (PS4) / X-Button (Xbos One). Don't use any directional buttons, just do light attacks and nothing else. This doesn't require any skill whatsoever and has a good chance at beating the CPU. It may take a few tries but it's an easy way that will win the fight eventually.