Special Summons from your Graveyard / Special Summons from your opponent's Graveyard / Sets from your Graveyard / Sets from your opponent's Graveyard / Special Summons to your opponent's field / Special Summons face-down
Ritual monsters require you to first summon then on the field with a Ritual spell.
After that, if they get sent to the graveyard, you can use any form of revival, unless it specifically says that you can only special summon the monster with a ritual spell, in which case it won't work.
That's because to special summon a fusion/ritual monster through a card effect can only be done if it was fusion/ritual summoned correctly. So since ultimate dragon is not fusion summoned you can't summon it with this card