Download PPSSPP from ppsspp.org or your app store. Version 1.12+ has the best adhoc support.
Disable all cheats, as variable memory manipulation causes immediate desyncs in multiplayer lobbies. Tekken 6 & Fighting Games adhoc server ppsspp
PPSSPP Ad-hoc Server is a feature that allows the emulator to simulate the PSP's local wireless multiplayer functionality. It enables players on the same network—or across the internet via VPN—to join the same game lobby for cooperative or competitive play. Core Functionality How to play multiplayer games with PPSSPP - GitHub Download PPSSPP from ppsspp
Once upon a time, two friends, and Maya, wanted to hunt legendary monsters together in Monster Hunter Freedom Unite adhoc server ppsspp