No, they wouldn't sell them in stores if they were.
No there is not
No it does not
Hacking IS illegal.
No. its not illegal, but it depends what you do with it.
no
No!
It is very unlikely for a GameShark being illegal because they sell it at a lot of different stores.And BTW why would you do that to a FRIEND?
Yes
No, but it will void your warranty. As long as you own the device, you can do anything you want with it, but downloading (non-homebrew) games to play on that hacked PSP is illegal...
PSP games are copyrighted pieces of software. They are not public domain. Downloading any PSP game without paying the publisher/developer is illegal.
If you meant putting an emulator on your psp and loading on Pokemon roms that is illegal.
Buy the actual game! don't use emulators they are illegal