Sound is the only type that should be made. It has a pretty decent number of Pokemon that could be converted, and every move blocked by Soundproof (with the exception of Bug Buzz and maybe Chatter) could become Sound type moves.
Pokemon that could be sound types (the more obvious ones in bold):
- Jigglypuff family - Politoed (Water/Sound) - Misdreavus family (Ghost/Sound) - Whismur family - Swablu family (maybe? Altaria would hate to lose its Dragon typing, but it isn't very Dragon-like, so...) - Chimecho family (Psychic/Sound) - Kricketot family (Bug/Sound) - Chatot (Sound/Flying) - Audino - Tympole family (Water/Sound suits them more than Water/Ground) - Meloetta (Sound/Psychic or Sound/Fighting depending on forme)
Meloetta in particular is a strange case, because dual Normal types (aside from birds) are rare and don't make all that much sense, and Meloetta has no real reason to be one. It feels to me like Normal was basically a placeholder for Sound.
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