Mega Man & Bass/Teleport System

The Teleport System
Unlike in any other Mega Man game, this Teleport System is not a rematch with bosses. Instead, in each teleporter hatch there's a 100-bolts worth Mega Bolt that can only be obtained using a specific weapon (an thus, only after the corresponding Robot Master has been destroyed).

Only after the eight Mega-Bolts have been collected, Mega Man and Bass will be allowed to access the final stages.