God of War 2 for the PS2 is massive. The original ISO file hovers around . Modern Android phones have enough storage, but downloading a file that large over mobile data is inefficient and time-consuming. Furthermore, the PSP version of God of War 2 (often ported or repacked for PPSSPP) requires clever compression.
The emulation community is working on:
When searching for downloads, be cautious of websites promising God of War 2 in sizes like . God of War 2 for the PS2 is massive