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1. Complete Classic Mode with any character other than Ike

2. Complete Event Match 20

3. Complete 350 VS Matches 

The cute but deadly puffball is back! Jigglypuff is probably the easiest character to unlock. To do this you have a couple of options. The easiest way is probably to complete Classic Mode with any character other than Ike. You can also complete event match 20 to make this character appear. The third way is to play 350 Vs matches. Whatever method you choose will cause the classic "Warning: Challenger Approaching" scene to appear. Then all you have to do is beat Jigglypuff in a 1 on 1 battle to unlock this character. Jigglypuff has no long range attacks whatsoever so I prefer to sit back and hammer her from a distance. She's a lightweight fighter so about 100 or so damage should do.

Well this was interesting. I played classic mode expecting to get Jigglypuff and couldn't seem to make it appear. I tried easy, normal, and hard with different characters each time and got nothing. Then I played the Pokemon event match on hard just to clear it, and this little Pokemon jumped out and attacked me afterwards. I was glad I'd played the event with the Pokemon trainer or I would have probably lost to the little ball of hot air.