I might as well say one then.
I have earphone, so listening Pokemon cries can be deeper. Particularly Primarina sounds drastically different from her previous forms in first time, but if listening deeply with earphones, the whole line has the slight bubble sounds, even herself which is covered by her "song" cry. Fitting detail for a singer attacking with bubbles.
Also, much parts of her cry has matching pitch with the move "Sing" which we often associated with anime Jigglypuff?, although different rhythm. Obviously she can learn Sing herself.
I can't think of other Pokemon with beautiful voice like hers. Hmm... maybe Cresselia that sounds like sparkles sound effect? Sylveon might be too, but her cry is somewhat "one-dimensional" compared to Primarina.
Maybe pretty much that solidifies her as the best Pokemon singer ever. Milotic may be called as the most beautiful Pokemon, but Primarina definitely has the voice (while also very beautiful) to rival her for that title.