Is ONE PIECE episode 736 filler?
Canon No, episode 736 of ONE PIECE is canon.
#736
Sending a Shock Wave! The Worst Generation Goes Into Action!
激震走る 動き出す最悪の世代！
Aired 10 Apr 2016
Mochibayo compiled this list from MyAnimeList's labels, because MyAnimeList's episode data is not reaching us at the moment.