In most countries, downloading a copyrighted game you do not own is technically copyright infringement. Nintendo and Takara Tomy hold the rights.
If you plan to play the game on a PC, you'll need a PlayStation 2 emulator like PCSX2. Follow the emulator's instructions to set up and configure it. If you have a physical PS2 console, you can burn the ISO to a DVD or use a USB drive. naruto gekitou ninja taisen special iso english download