How do you convert games to ps2 game?

Answer 1

(@Previous edit: Wrong, you can convert PS1 titles to PSP. I have an eboot of Final Fantasy VII and Xenogears that are completely playable on the PSP. In fact, I beat Final Fantasy VII on it and saw no hickups. I'm going to try and find a way to convert PS2 games to PS1 or directly to PSP. I'll post here if I can do it. End edit.)

Games are what they are and can not be converted from one Platform to another. That means that you can not change the game and you must change the platform for it to work. Game designers do not change a game to release, as an example, a PS3, PC, Nintendo Wii, Nintendo DS, and Xbox 360 version, they create a different game for each platform. Sometimes it takes multiple teams or even companies to put together all the different game versions before they can release a game like the Call of Duty Modern Warfare 3 and one of the reasons why MW releases are 2 years apart.

You can't, the PSP is nowhere near as powerful enough to play PS2 games. Even most modern PCs would struggle.

That would be using an emulator and they do not convert the game, they convert the PC to play PS2 games which is different. Your PSP has an emulator to play the PS1 games. Most Playstation products can play PS1 games because it was technologically very easy to accomplish unlike PS2 games which even the original PS3 had so much trouble the feature was discontinued. Even the PCSX2 emulator can only play about half the PS3 titles, but they have a different definition of playing a game. They still consider playing a game as playable that has problems playing as long as you can eventually complete the game.

Answer 2

Games are not converted. The new software must be written and tested. It is expensive and few games are ever released and never without modifications and improvements to the game.