This image has been going around the Internet for a few days, but thanks to Anime News Network, we now know who acquired these Pokémon balls subdermal implants. His name is Alex Finch, and he is a hardcore fan:
Finch spoke with ANN and stated that he has been a fan of the Pokémon videogame and anime franchise since he was in third or fourth grade, and that he chose to get six Poké Ball tattoos in reference to the number of Poké Balls which can be carried in the original videogames. He also noted that the tattoos shown are "just the beginning" as he plans to get additional tattoos of videogame, cartoon, and anime icons on the rest of the arm, including more Poké Balls.
Link via Geekosystem