No, but you need one before you can start a type rating on Multi crew aircraft.
No you don't. You can do it as part of your TR.
From LASORS:
Wherever possible, the MCC training should be
combined with the initial type rating training for a
multi-pilot aeroplane/helicopter, in which case the
practical MCC training may be reduced to not less than
10 hours if the same flight simulator is used for both the
MCC and type rating training.