The aircraft carrier Shokaku (or Syokaku in the spelling specified by the Navy Department, Tokyo in 1936) was sister ship to Zuikaku. These carriers displaced 20,000 tons and were some 800 feet in length overall. They carried 12 5-inch anti-aircraft guns and 60 aircraft. Shokaku was laid down by Yokusaka on 11 December 1937 and completed in 1941. With her sister ship she formed the Fifth Carrier Division of the First Air Fleet. 5th Attack Unit, 15th Attack Unit and 5th Fighter Combat Unit flew from Shokaku. She was damaged in the Battle of the Coral Sea in May 1942 and thus did not take part in the Battle of Midway (Midway, Battle of), but she served in the Solomons in August. She was damaged by SBD2 Dauntless dive-bombers from Hornet on 24 October 1942 in the Battle of the Santa Cruz Islands and sunk by the submarine Cavalla at 1210 on 19 June 1944 in the Battle of the Philippine Sea.
You can find out more about the Shokaku in the following Osprey book: