Is there an chance, that you could add Dragon Quest 5 PS2 to the Playstation 4 Store list, please?
I have heard within the forums, that PS4 can take PS2 games by Playstation Store download.
I've tried searching for an ISO online, but I had only came up with the Japanese version on Emuparadise.
It wasn't within my own language.
I've tried the PCSX2 blog, but suddenly, I get nothing in return. Just an unwanted application. 
There is none of that kind of ISO online in English Language for the PC.
I've tried looking up within the Playstation Store and it wasn't there.