Super Smash Bros. Wii U and 3DS Discussion

Only character I'm missing now is R.O.B. The consensus is that he's unlocked at 200 Trophies.

 Spoiler

I got ROB unlocked by beating Classic Mode with Game and Watch at Intensity 6.0.

It could have been a coincidence and lined up with something else, but I doubt there's only one way to unlock characters. It would explain all the different reasons people have noticed for why characters get unlocked.