If you can copy the ROM to a PS1 memory card then you can transfer to a Pocketstation using a PS2, yeah.. it's the same as transferring between any other two memory cards. Sorry, I don't know anything about commercial Pocketstation games, except that talking about where to obtain them is probably technically against the rules. There is homebrew, I doubt anything as complex as Pokemon (which you probably couldn't do that well on a 32x32 display anyway) but simple stuff like Tetris is out there. Spend a few minutes on google and you'll find it.