Gen 04a 10/2019
Changing this from Gen 03a to Gen 04a due to info on which sticker came out 1st. It appears the actual 00 Generation was the Spider-Man Captain America Dr. Strange blue sticker out in 10/2016 or possibly latter. None of that Gen books were variants .
Showing in a post from 11-2-19 there are 3 shown new variants with the Generation 4 sticker. https://boards.cgccomics.com/topic/444527-walmart-marvel-comics-variants/page/6/#comments