The cyan Mewtwo's Psystrike Final Smash represents Esna, a water spirit with a cyan color scheme whose body shape resemble Mega Mewtwo Y's.
The stage represents the oasis featured in Ever Oasis, which Esna creates after Tethu's brother, Nour, is kidnapped by Chaos.
The Flowery rule references Esna's alliance with the Seedlings, a race of nature-based creatures who help Esna create the last Oasis.
Other trivia:
This spirit's Lava-Floor Immunity ability references how Esna is a Water Spirit, which can extinguish fires.
In World of Light, the Esna spirit is located at a waterfall at the rapids area in the Light Realm, similar to the stage's waterfall setting.
