That's actually incorrect. Primarina learns Hyper Voice, which differently from Sparkling aria, doesn't hit the partner, so makes it the preferred ability for doubles.Its ability makes voice moves (including psychic noise) water type. But it is a useless ability as Primarina doesn't learn BoomBurst and the type change isn't accompanied by a boost.
Therefore Primarina likes to have Torrent as its ability.
Not that you smogon players would understand that official formats exist