The only notable PS4 emulator in development is Spine (formerly known as GPCS4) and RPCS4 (still in early stages). These work on high-end Windows PCs and can run only a handful of 2D indie games at low frame rates. Major AAA titles are nowhere near playable.
Sony’s PS Remote Play app allows streaming PS4 games to Android devices legally, using the console’s own BIOS without downloading it.
If you want PlayStation gaming on your phone, here are legitimate methods:
The PS4 uses an x86-64 AMD Jaguar CPU and a custom Radeon GPU. Android devices primarily use ARM-based processors. Translating x86 instructions to ARM in real time requires immense processing power and memory bandwidth—far beyond current mobile chips.
It is crucial to understand the legal aspect of emulation.
To stay within legal boundaries, users are expected to dump the BIOS and games from their own personal PS4 consoles. However, this is a complex technical process that requires a modified (jailbroken) PS4.