There is flicking in my animation using photonmapping, how can i fix it?

For animations you'll need a well balanced dense photon map, if not the low frequency noise produced by the photon map is able to surface trespassing Final Gather sampling. Also if you set glossy reflections 'as diffuse', it means that the photon map will be used to calculate the glossy reflection; if the photon map is low quality, the glossy reflections will flicker as well.