i believe the catcher must be in the catchers box before the pitch,also no other player may be in foul territory
5.02 Fielding PositionsWhen the ball is put in play at the start of, or during a game, allfielders other than the catcher shall be on fair territory.(a) The catcher shall station himself directly back of the plate. Hemay leave his position at any time to catch a pitch or make aplay except that when the batter is being given an intentionalbase on balls, the catcher must stand with both feet within thelines of the catcher’s box until the ball leaves the pitcher’s hand.PENALTY: Balk.(b) The pitcher, while in the act of delivering the ball to the batter,shall take his legal position;(c) Except the pitcher and the catcher, any fielder may station himselfanywhere in fair territory
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He has to be in foul territory, and he has to be directly behind the plate