For games that haven't been ported, you can stream them from a more powerful machine:
The Vita homebrew community has successfully "wrapped" several Android versions of PS2 games to run on the Vita. These require the original Android game files: ps vita ps2 emulator vpk
: Fake files meant to generate ad revenue for the hosting site. For games that haven't been ported, you can
: Would you like a guide on how to set up Moonlight to stream PS2 games from your PC, or are you interested in a list of official PS2-to-Vita ports ? : Stream PS2 Classics from a console to your handheld
: Stream PS2 Classics from a console to your handheld. 3. Warning: Fake "PS2 Emulator" VPKs
: Emulation typically requires the host system to be roughly 10 times more powerful than the system it is imitating. While the Vita is technically more powerful than the PS2, it lacks the raw "grunt" and specialized hardware needed for smooth PS2 emulation. 2. Best Ways to Play PS2 Games on Vita