Among the minute living entities, one being can excel another in one capacity or another. Like each of these living entities, the Lord is an individual, but He is different in that He is the supreme individual. God is also infallible, and thus in the Bhagavad-gītā He is addressed as Acyuta, which means "He who never falls down." This name is appropriate because in the Bhagavad-gītā Arjuna falls into illusion but Kṛṣṇa does not. Kṛṣṇa Himself reveals His infallibility when he says to Arjuna, "When I appear in this world, I do so by My own internal potency." (BG 4.6)
Thus we should not think that Kṛṣṇa is overpowered by the material potency when He is in the material world. Neither Kṛṣṇa nor His incarnations ever come under the control of material nature. They are totally free. Indeed, in Śrīmad-Bhāgavatam one who has a godly nature is actually defined as one who is not affected by the modes of material nature although in material nature. If even a devotee can attain this freedom, then what to speak of the Supreme Lord?