For those who still seek the NDS patch, it typically requires a "clean" Japanese ROM of the game and a patching tool.
: The Internet Archive and repositories on MediaFire are common places where community members host specific versions like the v0.6 English build. Inazuma Eleven 3 Nds English Patch Download
This guide is for educational purposes. The patch file itself is legal to distribute. However, the original game ROM ( .nds file) is copyrighted by Level-5 / Nintendo. You should only patch a ROM you have dumped from your own legally purchased Japanese cartridge. Downloading pre-patched ROMs from random websites is piracy and unsupported here. For those who still seek the NDS patch,
If you want, I can: