10 more HP and Psychic type (because that's what Poison became in DP). Other than that, it's exactly the same as the old card.
But about the type change, I never really understood why Poison was moved under Psychic in DP. Yes, Grass was weird too, but at least that made a little sense as a sort of reference to all the poisonous plant species out there. It seems like it was moved to Psychic just because, ya know, it's purple, and that kinda bothers me, perhaps more than it should.
That tangent aside, let's move on to the Gym Badge. Effect-wise, it's a way worse version of Roller Skates - you have a 50% chance of getting absolutely nothing, a 25% chance of getting just one card, a 12.5% chance of getting two, a 6.25% chance of getting three, et cetera. That just doesn't seem very good compared to Roller Skates' 50/50 odds of getting you three or nothing. The multiple prints are nice, but I don't see this card getting played; after all, Roller Skates hardly saw play in any but the absolute speediest decks, and it soon found itself outclassed by cards like Shaymin-EX.