The 24 avataras of Lord Vishnu are described in Skandha one chapter three of Shreemad Bhagvat Purana . It also mentioned that the incarnations of the Lord are innumerable. Apart from these 24 , there are lots of other incarnation of Lord Vishnu mentioned in Shreemad Bhagvatam.
For example , a avatara of Lord Vishnu called "Vaikuntha" is mentioned in Skanda 8 chapter 5
पत्नी विकुण्ठा शुभ्रस्य वैकुण्ठैः सुरसत्तमैः ।
तयोः स्वकलया जज्ञे वैकुण्ठो भगवान्स्वयम् ॥8.5.4॥
From the combination of Subhra and his wife, Vikunṭha, there appeared the Supreme Personality of Godhead, Vaikunṭha, along with demigods who were His personal plenary expansions.
It's also said in the next verse that Lord Vishnu , inorder to please Shree Laxmi created the vaikuntha abode , upon request of her.
I am interested to know more about this Vaikuntha Avatara.
So my question is -:
1.What is the story and purpose of Lord Vishnu's Vaikuntha Avatara?
Did Lord Vishnu took this avatara just to create Vaikuntha abode or also to accomplish some other task?