Who can you get Ritual Cards from in Duelist of the Roses?

You can get rituals from the graveyard slot machine from the following:

Pegasus - Gharma SWord Oath, Curse of the Millennium Sheild

The Labyrinth Ruler - Gate Guardian Ritual

Yugi - Black Luster Ritual, Dark Magic Ritual

The Darkness Ruler - Zera Ritual

Bakura - War Lion Ritual

Richard Slysheen of York - Revival of Sennengenjin

Llyr (Skull Knight) - Curse of the Tri-Horned Dragon, Cosmo Queen's Prayer

Mai - Revived Serpent Night Dragon

Ishtar - Turtle Oath

Tristan - Resurrection of Chakra

Weevil - Javelin Beetle Pact

Necromancer - Revival of Dokurorider

Mako - Fortress Whale's Oath

The Rituals that require reincarnating Fake Traps are:

Yamadron Ritual, Beastry Mirror Ritual, Commencement Dance, Hamburger Recipe,

Construct of Mask, and Puppet Ritual.

As far as I know, Ultimate Dragon Ritual cannot be obtained, but you can use graverobber or a similar card while fighting Kaiba to use it if you want.