PlayStation 3 user's have not seen a working Neo-Geo Pocket emulator (libretro Core) since way back on v1.0.0.2 of RetroArch (Ps3). Since that time we have seen the core with a regression for the PS3 (& other ports) making the core unusable. but ps3 dev and libretro contributor @Ezio as promised (when releasing the CFW -CEX / ODE variants) that a fix for Neo Geo Pocket was made (by developer R-Type) and the core was working a fix pkg for v1.6.3 would be released. That time has come as Ezio stopped by the forums to share this now working Neo-Geo Pocket Core for the PS3. Install version 1.6.3 then you can proceed to install this fix pkg afterwards.
Here it's the fix for NeoGeo Pocket (ngp).
For CEX: https://mega.nz/#!5YRlnKoK!mb_BOo3k5a7hnEgmoGzrPOyqOVswrLddy_HqPWppPtQ
For DEX: https://mega.nz/#!kVI1lSJQ!07_3ic-QeD_vXKSNHECggO8TzNn_MS5G28KlwWqixeU
Just install the fix over your RetroArch 1.6.3 installation.
Load any FBA compatible neo geo ROM. More complete archive (including files needed to run MVS and UniBIOS modes) might need additional configuration to force AES mode: In RaLibretro: Settings-Emulation-Force Neo Geo Mode-AES In RetroArch: Command-Menu Toggle-Options-Force Neo Geo Mode-AES. (Overview) – RetroArch is a N64 Console emulator, RetroArch is a frontend for emulators, game engines and media players.It enables you to run classic games on a wide range of computers and consoles through its slick graphical interface. Settings are also unified so configuration is done once and for all.
Retroarch Neo Geo Playlist
Retroarch Neo Geo Setup
Source: psx-place.com