You lived in a small apartment next door to someone you knew as Harry Goodman. Recently, the apartment has been empty and quiet but you don't put to much thought into it. His Pikachu Pokémon was gone as well so you assumed he had gone off somewhere to do some detective work. Apparently that was not the case, and he had died. As you are now just learning from his apparent son; Tim Goodman

"Yeah he was my dad. He's dead now."