"When quarantine was announced and we had to stay home, I thought nothing of it. When the pokemon were rounded up to the ranches, I thought of rainy days and long nights. When the pokemon started fighting back, I thought it was a crazy dream. When the pokemon overthrew us and ruled us, I didn't know what to think anymore." Today's a new day. A new day for all of us.

After the defeat of Tabuu, the "Super Smash Brothers" formed their own society and lived in prosperity for years. However, when a new evil arises to corrupt and takeover the land, the fighters will have to band together and give everything they got, to fight for a better tomorrow.