If you want good quality games, then they must be programmed by professionals. This means it is illegal to download games for free, at least the good ones. Freeware is out there, but is usually not that great.
OK，let me tell you .You can find a best PSP download site following these Checklist:
A Quick Checklist In Choosing The Right PSP Download Site
Is it a legitimate site?
Do they offer unlimited 24/7 downloads?
Do they have extensive databases of games available?
Do they have extensive databases of movies available?
Do they have extensive databases of music available?
How fast are the download speeds?
Are the games download there high quality?
Is the music download there high quality?
and more more….
You can go to visit http://www.download-psp.info to find out more reviews,comparisons and download links….

no, only demo from the playstation web site if you if have wifi but may be you can by surfing the web and playing interent games.

No dont listwen only part is true you can only search stuff read about stuff and down load demos on wlan Not wifi