You have to do one of these:
. Play 350 matches in Brawl, and then beat Jigglypuff in a fight.
.Complete the Subspace Emissary, then beat Classic mode with any character except Ike, and then beat Jigglypuff in a fight.
.Complete the Subspace Emissary, then beat Event Matches #1 to #20, and then beat Jigglypuff in a fight.
. Complete the Subspace Emissary, then return to Stage 18 (swamp). On the last part of the level where you are shooting yourself through barrels, stop on the platform below the new door. Go in and beat Jigglypuff in a fight, then finish the stage.
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Beat the subspace emissary.
well, first of all, you need to go through all the doors in spaceship emissary. there are also trophies you need to collect (try doing the difficulty on very hard, or intense to get a trophey of the bosses). there are also three additional characters that you can unlock after beating tabuu. Jigglypuff, Toon link, and Wolf. to unlock these characters, you need to go through a special door. Wolf is in the level titled: the ruins, Toon Link is in The Forest (i think), and Jigglypuff is in The Swamp. after doing that, I think you'll get a 100% in subspace emissary. if not, then check www.gamefaqs.com for information. I think they have faq's for how to beat subspace emissary on 100%
you have to do 350 battles. Finish the subspace emissary mode then go to the swamp level find a secret door in the area after giant diddy then defeat jigglypuff.
Having him join you in subspace emissary is the easiest and fastest way.
Either play 15 brawls, or unlock him via the subspace emissary.