Do we need to visit the blocked nodes in Radiant Historia?

Solution 1:

You might miss out on some of the story, but it shouldn’t affect your actual “completion rating”. However, keep in mind that it may not be possible to get the skill before you reach the blocked point. At the blocked point, you may receive some item or information that will allow you to get the skill you need in the other timeline. You can’t find something if you don’t know what you’re looking for!

(That can go for you, personally, but even if you use a guide, Stocke still may not know what to say/do to get the skill)