Have the computer play against itself! You can complete better than 
50% of the matches by equipping your Mechs with AI, full shields,
and max power boosters(for max time). At the start of the fight, set
your mech on auto and watch the victories accumulate.

Suggestion: The SUN C works well using AI. The ANNA model works good for
human players(using the circular swinging move).

Cheat: Collect all the money you can from the bar plus the hidden Mech
(sell it). Then save the game, exit, and reload. All the money will have
returned. By doing this you can collect as much $$$ as you need. The
"money counter" is also reset after you complete a match.