Block: The Pokemon moves with unnatural speed to block off an opponent’s exit or attempts to gain distance. Block also releases a white energy that encapsulates the opponent, preventing them from getting too much distance. While Blocked, an opponent is more vulnerable to a follow-up attack, especially if they were moving with enhanced speed when Block is performed. In a switch battle, the Pokemon also moves with an unnatural speed to block any attempt to switch the opposing Pokemon and the move's energy prevents the opponent from switching out that Pokemon in between rounds for the duration of the battle.
You can't switch out to Honchkrow.