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In X-Men: Days of the Future Past movie, the primary mission of Wolverine was stopping Mystique from killing Trask. With the help of Quicksilver, couldn't he achieve this within 0.0001 second? This looks easier than breaching the Pentagon.
They never even needed to identify Mystique. All Quicksilver needed was to be around Trask until someone shoots a bullet at him, divert the bullet and capture the shooter. Done!
Why exactly did Wolverine and company avoid using Quicksilver for this mission?
The film's writer, Simon Kinsberg addressed this point in a podcast interview for Empire Magazine (39:24)
"When asked why the X-Men didn’t take Quicksilver to Paris with them, Kinberg answered, “I love that people are asking this question, because I think it comes from people loving Evan Peters in the film. It was just a story decision. They go to Peter to help them with one mission to break Erik out of prison. He completes the mission so he’s done for this film…”
Out of universe, the reason is far more mundane. The scenes in Paris were written and scripted (and partially filmed) before the character of Quicksilver was ever added to the film, presumably as a way of preventing Marvel from taking full ownership of the rights to the character.
The only way they could add him to the cast was to write an entirely new scene which they could then place at the start of the film and hope that the film's viewers didn't notice that he simply disappeared.
Given Quicksilver's awesome power, him being in Paris would have killed a lot of the suspense in those scenes. And like others said, Quicksilver was a late addition to the film, so they weren't going to reshoot the movie just to include him everywhere.
However, if you want an "in-story" explanation, maybe Wolverine and Xavier felt he was too young. He looked to be a highschooler, and his mother would surely freak out if some random guys decided to take him to Paris. Also, Quicksilver has had run ins with the law, so maybe Xavier didn't want to deal with his compulsive stealing and hyperactivity for a prolonged period.
