Ok, I think I understand what you mean.
Let's use Torchic as an example. It learns Flamethrower, but only if you stop it from evolving.
But, if you took a Combusken that HADNT learned Flamethrower to the Move Tutor, it couldnt relearn Flamethrower because Combusken doesn't learn it naturally. If you took a LV 100 Torchic, it could relearn Flamethrower, though.
I think that's the answer to your question...?