As of late 2024, the most complete pack is v2.1, covering over 90% of the minigames (called "Rhythm Games"). The only missing pieces are a few obscure UI prompts and the credits sequence.

You will need a few things:

Dolphin emulator | How to install texture packs (simplified guide)

HD texture packs for Rhythm Heaven Fever are typically shared via emulation forums (such as the Dolphin Forums, GBAtemp, or Reddit’s r/emulation). A well-known example is the Rhythm Heaven Fever HD Texture Pack v2.0 by fans like “PeachBeach” or “NintendoHomebrewGuy” (names vary over time). Installation involves: