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Single shot x-ray diffraction (XRD) experiments have been performed with an x-ray free electron laser under pulsed high magnetic fields up to 16 T generated with a nondestructive minicoil. The antiferromagnetic insulator phase in a perovskite manganaite, Pr_{0.6}Ca_{0.4}MnO_{3}, is collapsed at a magnetic field of ≈8 T with an emergence of the ferromagnetic metallic phase, which is observed via the accompanying lattice changes in a series of the single shot XRD. We discussed the feasibility of the single shot XRD experiment under ultrahigh magnetic fields beyond 100 T, which is generated with a portable destructive pulse magnet.