Oh cmon Xavier and Cerebro are vastly beyond the capabilities of the human race in Pacific Rim.
With Beast and Erik involved, Xavier will create a Cerebro capable of creating a link between the Earthlings and the Kaiju.
Shaw just can't be hurt by the Kaiju. And has interesting kinetic abilities that allow him to hurt them in the long run.
Erik also sensed metal from miles away, he can perform his metal ball technique from a semi-safe distance.
Cyclops can unleash his full Optic Blast during such attacks. It will help. Especially against the flying one.
Jean unless she has Phoenix powers can't do anything.
I see the X-men beating Kaiju on Earth soil. But circumstances put them at a disadvantage in the long run.
That's assuming telepathy will work on a Class 5, and not explode Xavier's brain. IIRC, Newt and the other scientist nearly died just doing a neural handshake with the secondary brain of a baby. The full brain would have probably killed them, and that was just a baby. The X men have to deal with Class Fivers.
Pacific Rim didn't have class 5 mutants with telepathic abilities with one such individual (with aid) creating a machine that amplified his powers to scan the entire planet.
Being 3 mutants involved in the list. 4th being Beast is the cherry on top.
Pacific Rim just had human hopefuls to accomplish the tasks.
But those were only people. I'm pretty sure the collective hive mind of the entire Kaiju species is far more overwhelming than the collective conscious of the human race. Reading just one of their minds could overload Xavier. He'll probably explode if he attempted to use a Cerebro. And can you build a Cerebro out of pieces of downtown Hong Kong while it's being simultaneously destroyed in battle?