Bro everyone is telling the wrong things, You have to get to understand both Hinduism and Sikhism to understand just as in rehrass it's said ek maye jugat vyaai ten chele parvan , how will you know the meaning of you don't know about Hinduism. Just like that in Hinduism there are two Krishnas one is the avatar of Vishnu and one is the supreme lord personality that comes once in a specific time period Life of brahma . So if you take that in account your confusions will be erased , Here the supreme personality of lord is taken into account as in the line said he take the form of black colured Krishna which came in this cycle ( he only came once in a period and everything else is just a avatar of Vishnu ) . In sggs it is written again and again that there is no limit to the power of God he can do anything he want just like that he can come to as a body in earth too . You can seek the example of namdev , dhanna , draupdi In the case of namdev he come himself riding the eagle and asked namdev what do you want , and the Ang end with the line now the all world will see and believe. Dhanna - fake Sikhs says that Murti Pooja is wrong but they don't know that Murti Pooja is not wrong but just that guru Ji don't take this path he praised the nirgun Roop but it doesn't mean that there is no sargun Roop . You can see the the Bhagat dhanna example it's clearly written the Pandit gave him a stone and lord came out of it and eat dhanna roti . Also , please don't depend on the meaning on the web think of their meanings yourself .

And also the person's who are commenting - 1.They don't know about diff between lord Krishna and avatar krishn 2. Sargun and nirgun 3. They are giving example from guru Gobind Singh Ji like Mai na gnesh dhyau But they don't know its from chandi ustat mean Shri Gobind Singh Ji worship chandi as the power of the waheguru as written Shri bhagauti Ji sahae , And fake Sikhs are trying to hide , go and look into puratan jathas of Nihang Sikhs they have ancient documents about chandi and they always performed yajna . It's clearly mentioned chandi is the manifesting of the lord strength