Westworld’s MIB is in Host form with full abilities. Lost’s MIB can change into Smoke Monster only when on the island but otherwise remains with his powers.

Round 1: In the Delos parks.

Round 2: On the island.

Round 3. At Stonehenge. (UK)

Round 4: In Times Square while a gigantic squid is also attacking.

Round 5: Fighting on top of Mount Roraima.

Bonus round: Boy in White from ‘From’, vs both Man in Blacks, setting is Fromland/Fromville and he has all his abilities.