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. Rather than a direct port, this is a "from-the-ground-up" rebuild designed to run efficiently on the PSP’s limited hardware. Deltarune Ports:

was built in GameMaker Studio 1.4, which does not natively support PSP exports. However, several developers have taken on the challenge using alternative engines and recreation methods. Key Development Projects Choby GM Port (The "Sticks" Version):

Several homebrew creators have taken on the challenge of recreating Undertale for the PSP: undertale.com

Since these are not official retail games, they are distributed as homebrew files—often as an New Undertale PSP port : r/PSP