CAN ANYBODY HELP ME ON HOW TO FIX HOTSPOT MULTIPLAYER LAG IN TEKKEN 6 PPSSPP

I've been searching on YouTube with no luck and reading the official wiki but both of us are dumb and couldn't understand the instructions. we also got like the type of strong internet/internet router like (idk what's the name) also don't know how

another help; is it possible to play PPSSPP Tekken 6 online like being on another house with internet but like we're separated, like online Tekken 8 is what I'm trying to say and if it's possible please do help us about that too