Playing through your M圜areer mode will earn you VC for each match and optional objectives you complete. This can get time consuming and seem like a grind, but its the most efficient and simplest way to earn quicker VC. The higher the rating of the match, the more VC you will earn each time. Repeating this process again and again will keep earning you more VC for every match you finish. Complete your match as normal, then hit rematch to fight again.
