The red Jigglypuff represents Mallo, a short and round character who features a red color scheme and a top knot.
The stage represents Pushmo Park, the main setting of Pushmo which features a grassy area, a blue and cloudy sky, and windmills.
The music track represents the music track of Stretchmo, which features Mallow as the main playable character.
Jigglypuff's Puff Up Final Smash and favored grabs and throws reference the gameplay mechanics of Pushmo which include grabbing, pushing, and pulling blocks.
Other trivia:
This spirit's Grab type further references the grabbing gameplay mechanic of Pushmo.
This spirit's Weight ↑ ability how Mallo is a sumo wrestler, which is a heavyweight character.
