Funny though I checked Bulbapedia when I saw that scene and discovered that Cosmog can actually do that.

Lillie has a talent in being a trainer.

PunLlarena said:

This is the scene where Lillie tells Cosmog to use Splash.

Funny though I checked Bulbapedia when I saw that scene and discovered that Cosmog can actually do that.

Lillie has a talent in being a trainer.

I think it's more that splash is the only move Cosmog knows besides teleport (which would cause trouble), so she was just going with that.