Video games, anime shows, movies—as the Pokémon brand expands, so too does its musical universe. Pokémon themes tend to be as colourful and high-energy as the pocket monsters they accompany: “Pokémon Theme (Gotta Catch Them All)” packs all the synth-pumped drama and squealing guitars of an ‘80s arena-rock anthem, while “Pokerap” blends hip-hop flows, cheerleader chants and rave-ready electronics. But Pikachu and crew occasionally cross paths with some IRL pop stars—like alt-rap sensation Post Malone, who contributed a space-age cover of Hootie and the Blowfish’s “Only Wanna Be With You” to the franchise’s 25th-anniversary festivities.