Are you sure it was an actual tattoo? Like, was it temporary, or did you actually ink it? Your Facebook picture doesn't look like there's anything Pokemon on it...
Oh yeah, they aren't real tattoos, just pictures you print on your skin, I don't know what they are called. You can take them off by washing. Normally you just put them on your hand or something, but I put the "Pokémon" text on my forehead.