Clefairy or...
Cleffa/Clefable
A) you said someone was close, and Jiggly was guessed....
B) Clefairy, Base set again, and Clef is music
C) Found in Caves??? Evolves with a stone???
D)Noty a clue on the green card thing (unless it is a TCG reference and Clefairy is colorless)
wiat, Clefairy are believed to come from sapce, so Alien, Green Card, I get it, or maybe not....