You will need three things: a legal copy of the game ROM (an ISO file), a patch file (usually .xdelta or .ppf ), and a patching utility.

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If you have a modded PS2 (with Free McBoot and OPL), you can use a USB drive or internal HDD. Use a tool like ESR Patcher after the English patch to make the disc bootable on non-modchip consoles, or simply run the patched ISO via SMB/HDD in OPL.

Interestingly, a very high-quality Indonesian translation patch exists which some English speakers use as a bridge, as it is often more complete regarding the story text. Essential Tips for English Players

This produces a brand new, fully translated English .iso that you can run on a PS2 emulator or modded console. 🌐 2. Language & BIOS Region Settings