It's too bad that _______'s Chansey, along with Imakuni's Doduo were never released in places outside of Japan. I REALLY would have liked to have seen what Imakuni's Doduo would be like if it were printed in English. This is the translation which can be found on Apprentice:
Imakuni's Doduo
50 HP
Power: Run Around: Hold this card and throw it, because Doduo is running away. Throw the card horizontally with a snap to get the furthest distance.
[CC] Make Harmony (30) When you use this [attack], you must sing from the moment you use it and durring your play. Afterward, do 30 damage to the defending Pokémon.
Weakness: Lightning
Resistance: Fighting -30
Retreat: 0
This is _______'s Chansey:
_______'s Chansey
90 HP
[C] Lucky Egg ( ) Flip a coin. If heads, draw 2 cards from your deck. If tails, take 2 cards from your hand and put them into your deck. Shuffle your deck afterward.
[CCC] Lucky Punch (10+) Flip a coin. If heads, this attack does 30 additional damage.
Weakness: Fighting
Resistance: Psychic -30
Retreat: 1
I know that these cards were released in the Japanese Gym I (elements from Gym I and II were combined to make Gym: Heroes and Gym: Challenge). However, I do not know how rare they are.