During the final fight in The Wolverine, Logan-San had his adamantium claws sliced clean off by The Silver Samurai, leaving him with organic bone claws that grow back through the stubs of the adamantium coating. read more
At the climax of the film, however, his claws have grown back as bone, not adamantium. At this point, there is no official explanation as to why he has adamantium coating his claws in Days of Future Past, however the current prevailing theory seems to be that Magneto re-applied the adamantium to his body, a reverse of what he did in the comics. read more
During his exposure to Adamantium whilst having it bonded to his skeleton, his DNA was manipulated into seeing the Beta-Adamantium as his Skeleton. He can regenerate his Skeleton very quickly, but the Adamantium takes time to grow back. So he probably just had a few weeks with normal bone claws, until the Adamantium Beta grew back. read more
At this point, there is no official explanation as to why he has adamantium coating his claws in Days of Future Past, however the current prevailing theory seems to be that Magneto re-applied the adamantium to his body, a reverse of what he did in the comics. read more
Both these characters help Wolverine to his metal claws back (with major help from Magneto of course, because he controls metal) so that they can fight the Giant Mutant Destroyers in X-Men: Days of Future past because Wolverine has the power to heal. read more
Possessing an accelerated healing factor, keenly enhanced senses and bone claws in each hand (along with his skeleton) that are coated in adamantium; Wolverine is, without question, the ultimate weapon. read more