Krṣṇa's Appearances and Activities
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sentient beings, I still appear in every millennium in My original transcendental form.” (Bg. 4.6)
The word  ātma-māyayā  means that Krṣṇa descends as He is. He does not change His body, but we, as conditioned souls, change ours, and because of this we forget. Krṣṇa knows not only the past, present and future of His activities, but the past, present and future of everyone's activities.
vedāhaṁ samatītāni vartamānāni cārjuna bhaviṣyāṇi ca bhūtāni māṁ tu veda na kaścana
“O Arjuna, as the Supreme Personality of Godhead, I know everything that has happened in the past, all that is happening in the present, and all things that are yet to come. I also know all living entities; but Me no one knows.” (Bg. 7.26)
In  Śrīmad-Bhāgavatam  we also find that the Supreme Lord is defined as one who knows everything. This is not the case with even the most elevated living entities, such as Brahmā and Śiva. ● Only Viṣṇu or Krṣṇa knows everything. We may also ask that if the Lord does not change His body, why does He come as an incarnation? There is much difference among philosophers concerning this question. Some say that Krṣṇa assumes a material body when He comes, but this is not the case. If He assumed a material body like ours, He could not remember, for forgetfulness is due to the material body. The actual conclusion is that He doesn't change His body. God is called all-powerful,