Here's a link to a picture of the card:
http://pokemon.tcgplayer.com/tcg/scans/challenge/rs_mg.jpg
It says that when a player puts a basic pokemon on the bench, they flip a coin and if they get tails, the put damage counters on that pokemon. It never actually specifies how many! I don't mind it though, because when I'm playing a friend and he gets tails, I'll tell him to put on enough counters so it gets knocked out,
http://pokemon.tcgplayer.com/tcg/scans/challenge/rs_mg.jpg
It says that when a player puts a basic pokemon on the bench, they flip a coin and if they get tails, the put damage counters on that pokemon. It never actually specifies how many! I don't mind it though, because when I'm playing a friend and he gets tails, I'll tell him to put on enough counters so it gets knocked out,