When Miss Fortune's ability readies another Miss Fortune, can that second Miss Fortune move to the same battlefield before the showdown starts from the first Miss Fortune's move?

Ruling: No, the showdown starts automatically when the first Miss Fortune moves to the occupied battlefield, so you cannot move the second Miss Fortune before the showdown resolves.

Nuances:

• In theory, showdowns can be delayed by move triggers or if another showdown is already ongoing, but standard moves are base speed and cannot be performed during a showdown or chain regardless