This variant Wolverine has the X-men of his universe resurrected right before the final fight and Cyclops, Storm, Jean, Beast, etc. join him, Deadpool, (possibly the Deadpool Corps? Also possibly Laura?), and the mutants in Deadpool’s movies for the final showdown.
At the end, Wolverine and his friends return to their universe, while Deadpool and his friends are unable to return home but are able to enter the MCU. Due to multiversal shenanigans that Cassandra Nove gets into, the mutants such as Colossus, Negasonic, and Yukio entering the MCU sets off a universal signal to awaken the (up to this point) dormant mutant gene with potential mutants in the MCU. Thus setting the stage for the MCU’s X-men and explaining why no mutants had appeared at this point in the MCU (certain individuals could be said to have managed to have their mutant gene awakened prior to this, such as Apocalypse in his backstory).