I was playing with a friend and I make my creature attack his planeswalker, but he "chose" to take the damage toward himself, saying he can block his planeswalker. I also used sorcery to take control of one of his creatures and attacked his planeswalker with it, but he did the same thing. Can he actually choose to take the damage that was dealt towards his planeswalker?
You should post these questions in the Rulings forum so you can get an answer much sooner.
No, your friend is wrong. You attack either your opponent or one of their planeswalkers. They can choose to block the attacker(s) with their creatures but they cannot step in front of the attack themselves to stop the damage to their planeswalker.
No, your friend is wrong. You attack either your opponent or one of their planeswalkers. They can choose to block the attacker(s) with their creatures but they cannot step in front of the attack themselves to stop the damage to their planeswalker.