Stadium
Translation: Each player heals 10 damage from each of his or her Benched Pokémon at the end of his or her turn.
It is currently unknown what set this card will be in, so for now, discuss!
EDIT:
New Translation: Once during his or her turn, each player may choose 1 of his or her Benched Pokemon and restore its HP by 20.
You can only play 1 Stadium next to your Active Pokemon during your turn. If a Stadium with a different name comes into play, discard this card.