How do you unlock all characters in ssbb the fastest or easiest way?

First go to special brawl.Second set the flower head and stanima.Third pick you character random and set the computer player as level 9 and set it's HP to 1 and yours to 300-10.And forth select the stage as random(It may take 2 hours to unlock all characters this way).It's harder to go to the subspace place and complete it 100%.Why not take the easier way.