hmmm can i ask some dl links for best PSP, Playstation And Playstation 2 emulators?
Use EmuCR to get them and to keep updated. As for the emulators themselves, JPCSP, the PSP one, still needs a lot of work, but you can play most 2D games (with the exception of anything done by tri-Ace) and a couple of 3D ones. PCSX2, for the PS2, has great compatibility (once again with the exception of tri-Ace games unless you brute force through them with a 2600K on software mode) but I haven't tried it for 6 months. And for PSX, you should go with PCSX, just make sure to get the plugins that aren't provided with the emulator.