Its very easy
Step 1 : Download Drastic emulator on your phone
Step 2 : Download Inazuma Eleven rom from the internet
Here's the link
https://romsmania.cc/roms/nintendo-ds/5535-inazuma-eleven-239076
Step 3 : Locate the rom in Drastic and enjoy
Welcome to the sub! I saw you tried asking this question before in another thread and we have a weekly question thread that you can ask questions like this in, if it's not on the front page you can find a button to it on the right hand side. Please try to post future one answer questions there.
As mentioned you can find the subs here at Ryuu Rogue's archives: https://www.livejournal.com/tools/memories.bml?user=ryuu_rogue&keyword=Releases%20-%20Inazuma%20Eleven%20GO%20CS&filter=all
https://nyaa.si/view/1078030 Well last time I checked, the quality was pretty bad. If you download the videos from the people who created the subs you have much crisper video quality (its stil 720p for og & go cause they never aired in 1080p, ares in Orion is 1080p iirc)