If you meant RetroArch (common typo), it also requires a dumped PS2 BIOS for PCSX2 core. The same legal advice applies.
The BIOS (Basic Input/Output System) is a low-level firmware stored on every physical PlayStation 2 console. It handles booting the system, managing hardware (controller, memory card, DVD drive), and launching games. Emulators can’t legally include it—you must extract it from a PS2 you own. retromania ps2 bios link