I have an example from the anime.
This is form the first season in the episode The School of Hard Knocks. In it the level Pidgey evolves and learns some of its moves are stated.
Specifically, this episode states that Pidgey evolves at level 18, it learns Whirlwind at level 21, and Wing Attack at level 31.
Note: Those levels were accurate in Gen I, even if they are wrong now,
Source: I remembered the episode and went back and watched the relevant part.
I don't recall other instances like this off the top of my head, but there might be more.