The temple will need to be rebuilt.
Is the Antichrist the one who rebuilds it?
The temple needs to exist by the middle of the tribulation period. With modern building techniques, the tribulation could actually start before the rebuilding of the temple does.
Christ was the fullfilment and there will be no 3rd Temple, as there is no further need for sacrifice.
True! But everything is ready for the Temple, all they need is the go ahead signal and get rid of the monstruosity on the Temple Mount. It all could be done within a month, according to some Jewish groups.