I also feels annoyed with the flickering on Armored Core, Wipeout Pulse, and The Simpsons Game :/ tested on geforce, intel HD and radeon all have the same issue.
Setting frame-skipping to 3 sometimes helped removing the flickers but it will cause the animation/movement to be laggy (5/20 FPS/VPS)
Edit: It seems the main culprit is Multithreaded, disabling Multithreaded will remove the flickering issue.
Alternatively, using Non-buffered Rendering can greatly reduces the flickering (rarely flicker but may still shows black flicker once awhile)
Setting frame-skipping to 3 sometimes helped removing the flickers but it will cause the animation/movement to be laggy (5/20 FPS/VPS)
Edit: It seems the main culprit is Multithreaded, disabling Multithreaded will remove the flickering issue.
Alternatively, using Non-buffered Rendering can greatly reduces the flickering (rarely flicker but may still shows black flicker once awhile)
PPSSPP Multiplayer Guide: https://github.com/hrydgard/ppsspp/wiki/How-to-play-multiplayer-games-with-PPSSPP