I've been to these temples in the game that have spirits tell me how to get ultimate fire, dark, etc. I've gotten down you have to breed certain monsters to get the final monsters of each type.
Here's the descriptions I got plus what I could figure out as the monsters fitting the descriptions so far
Giant Fish: Aquastorm
Blade of Dark: Pencilhead
Beast of the Volcano
Giant Rock Elephant: Elevil
Giant Forest Beast
Mountain's Gale Wind
Shining Stone: Gemfire
Shining Scarab: Snitch
Flowering Insect: Plantagon
Dark Lizard: Tremblice
Fiery Tiger: either Katsuya or Kitican
This is all I could get for now If anyone could post how or where to get these monsters and breed them to see if they work that'll be a great help.
the mountian wind is ragori
the giant forest beast is Fernaurus
Someone else posted the fire, water and plant variants. Problem I found, you can do something like breed the fire+water final monster together to make an even MORE final monster. A fire/water mixed moveset with a spirit type monster.
sorry thats wrong im not sure but it might be flutform
Got some results from breeding. It seems you get supreme monsters from the combinations. For Ultimate water you get Orcanator And for light and darkness it's Fluttermus and Purpleeze. I even bred those two and got an extreme spirit monster with light/dark attacks called Chicklox.
actually the mountain gale wind is cyclonox