After working up, she sailed to join the main body of the BPF off the Japanese coast on 6 July, and rendezvoused with them ten days later. "Implacable" flew off eight Fireflies and a dozen Seafires against targets north of Tokyo on 17 July, but only the Fireflies were able to locate their targets because of bad weather. Eight Fireflies and twenty Seafires attacked targets near Tokyo the next day, before more bad weather halted flying operations until 24–25 July, when the BPF's aircraft attacked targets near Osaka and the Inland Sea, crippling the escort carrier . After replenishing, airstrikes resumed on 28 and 30 July, the British sinking the escort near Maizuru. A combination of bad weather, refuelling requirements and the atomic bombing of Hiroshima delayed the resumption of air operations until 9 August. During the day, "Implacable"s Seafires flew 94 sorties and her Fireflies flew 14 against targets in northern Honshu and southern Hokkaido for the loss of two Seafires. The attacks were repeated the next day, sinking two warships, numerous small merchantmen and destroying numerous railroad locomotives and parked aircraft. The BPF had been scheduled to withdraw after 10 August to prepare for Operation Olympic, the invasion of Kyushu scheduled for November, and the bulk of the force, including "Implacable", departed for Manus on 12 August. Her aircraft flew over 1,000 sorties since her arrival the previous month.