What did the court decide in Faretta v. California?
Answered for: US
The Sixth Amendment does not provide merely that a defense shall be made for the accused; it grants to the accused personally the right to make his defense.
The Court held that a defendant in a state criminal trial has a Sixth Amendment right to refuse counsel and conduct his own defense when he voluntarily and intelligently elects to do so. The sentence above is the court in its own words.
This answer is true in US and nowhere else on this site. Another jurisdiction is another answer, or an honest gap: see what has been read for US.