"Hajime no Ippo: The Fighting!" is a fighting game based on the popular Japanese manga and anime series "Hajime no Ippo" (also known as "Fighting Spirit" in some countries). The game was developed by IGN and published by SNK Playmore.
The PKG version you're referring to is likely a re-release of the game, which includes updates and possibly additional content. Unfortunately, I couldn't find specific information on what updates are included in this PKG version. hajime no ippo the fighting pkg ps3 updated
You're looking for a guide on "Hajime no Ippo: The Fighting! PKG" for the PS3. Here's what I've got: "Hajime no Ippo: The Fighting