You can get ten points a minute if you go to Training mode, choose a character 
and opponent, then leave the game on for about five hours. Note: Do not pause 
the game.
Plug in a second controller, go to options, change the time to 30 seconds, and 
turn up the damage. Go to Versus mode, turn the handicap down on controller two, 
and fight. You will get 100 points for each match.
To get easy points in Arcade mode, fight up to Abyss on any difficulty on high 
damage. Your best difficulty setting is recommended. Once at Abyss, 
intentionally die on purpose multiple times. Continue, then die again. You will 
get 100 points every time a continue is used. When you finally defeat Abyss, you 
will also get 50 points times the difficulty setting.