A Jigglypuff wearing a ribbon with a heart gem in the middle of it.
Said ribbon seems to amplify her fairy power by...alots, her ribbon gem grows as it absorbs fairy power around it and releases it toward Ballonpon body.
As the extreme amount of energy flow into her, Ballonpon body seem to expand bigger and bigger... Nobody knows how big she's capable of getting, there's probably no limit to her fairy growth~