Butterfree
HeartGold & SoulSilver #16
Formats
Tournament formats
not legal
not legal
not legal
not legal
Block formats
not legal
not legal
not legal
not legal
not legal
not legal
Historic formats
not legal
not legal
not legal
not legal
not legal
not legal
not legal
not legal
not legal
legal
legal
legal
not legal
not legal
not legal
not legal
not legal
not legal