Over the characters long history in the Marvel Universe, he has undergone many changes and evolutionary shifts.
The reason why is relatively obvious: it doesnt exactly fit with the more modern iteration of the character.
Reed Richards is most commonly depicted as a man of science, who is dedicated to more tangible pursuits.
However, none of theFantastic Fourmovies have established Reed Richards as being trained in martial arts.
The reason behind this largely seems to be that it hasnt been necessary.
As such,Reed Richards martial arts abilities have never needed to be called uponfor his live-action appearances.
Even so, it has not been used in any of his movie appearances.
The ability has yet to be employed in any of the Fantastic Fours live-action outings, though.
An ill-defined example of this is Mister Fantastics resistance to telepathy, which has previously been established in comics.
Should Reed be aware of impending telepathic threats, he can stretch his mind accordingly to resist its effects.
Summary
The Fantastic Four is a superhero franchise centered on Marvel Comics' first family of superheroes.