Hollow Knight does not have an official PSP release or a native ISO file.

A stream from a PS3 or PS4 to a PSP (which requires a console).

Emulation Skins: Visual mods for other games or the PSP interface that mimic the Hollow Knight aesthetic.

In short: No. The PSP is missing nearly everything. The game’s Unity engine requires far more memory, processing power, and storage. Even the PSP’s successor, the PlayStation Vita (with 512 MB RAM and 128 MB VRAM), would struggle to run Hollow Knight natively without heavy optimization.

Subscription Services: Available on the PlayStation Plus Game Catalog for Extra and Premium members. Unofficial Community Ports

Option 2: Play Similar Metroidvanias on PSP

While you can’t play Hollow Knight, the PSP has an incredible library of 2D action-exploration games that scratch the same itch. These are available as legitimate PSP ISOs (which you can dump from your own UMDs or buy from the PlayStation Store before it closed). Top recommendations:

Part 3: What About PS Vita? (The Closest Real Option)

Many people searching for “Hollow Knight PSP” actually own a PS Vita, which is backwards compatible with many PSP games but has its own native library.