In a Royal Rumble match, build up your momentum and wait to get a full momentum bar.
Then before your momentum dies down get your opponent in a piledriver or Samoan drop ultimate grapple move.

For a piledriver grapple move, go into the powerbomb position facing the arena floor as close to the ropes as possible and press down.

Do the same with the Samoan drop except face side ways and press right (when pressing up or right, press in on the analog stick).