Can You Download Halo 2 on PSP Go? No — Here's Why & Alternatives

You cannot play Halo 2 on any PSP model, including the PSP Go.

Why It's Impossible

Platform Exclusivity: Halo 2 was developed by Bungie exclusively for the original Xbox (2004). It was never ported to PlayStation Portable.
Architecture Mismatch: Xbox uses x86/CPU+GPU; PSP uses MIPS CPU + custom GPU. Code cannot run natively.
No Emulation: The PSP is far too weak to emulate the original Xbox. Even modern phones struggle with Xbox emulation.

Platform	Version	Notes
Xbox Series X\|S / Xbox One	Halo 2: Anniversary (in MCC)	4K/60FPS, remastered graphics, online multiplayer
PC (Steam / Microsoft Store)	Halo 2: Anniversary (in MCC)	Mouse/keyboard, ultrawide, mods, cross-play
Xbox 360	Original Halo 2 (disc) / MCC	Backward compatible; MCC preferred
Original Xbox	Original Halo 2 (disc)	Authentic experience, system link LAN

The PSP Go (2009) is digital-only (no UMD drive). It plays:

It cannot play Xbox, PS2, GameCube, or Wii games.

Downloading PSP game ISOs you don't own is piracy. Custom firmware (CFW) voids warranty and risks bricking. Only install games you legally purchased.

Bottom line: For Halo 2, get The Master Chief Collection on PC or Xbox. For PSP Go, enjoy its actual library.

PS2 Games