The possible options are WarGreymon, BlackWarGreymon and Omnimon.
No, Bacchusmon is not currently the mega form of ExTyrannomon as of 2014 however its Mega form in Digimon World Dawn and Digimon World Dusk is Ghoulmon
The spirits from the Ten Legendary Warriors are mostly absent from this game. The only available form is Susanoomon, who is treated as a normal Mega level Digimon in the game instead of a spirit.
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As of 2015 there's been no confirmation that Palmon's Mega form has been changed in any version of the Digimon series, Mimi's Palmon from the series is still confirmed to warp digivolve to her Mega form of Rosemon due to the Digimon Adventure video game.
They are Mega level Digimon.
At the moment (as of December 10, 2015) the ultimate level form of Digitamamon cannot digivolve or mega digivolve to any mega-level Digimon called HolyDigitamamon the only mega-level Digimon that Digitamamon can digivolve into are Titamon which is known as a "One-Man Digimon" and has the Virus attribute and Digitamamon can also digivolve to Devitamon which is a Mega-level Digimon, has the Mutant type and has the Data attribute.
Duftmon is not typically considered the Mega form of Spadamon in the Digimon franchise. Instead, Duftmon is often associated with the evolution line of other Digimon, such as the royal knights, while Spadamon evolves into different forms, like Spadamon's champion or ultimate levels. The evolution lines in Digimon are generally fixed, so Spadamon's Mega form would more likely be a different Digimon altogether.
Agumon is a Rookie-level Digimon that first appears as Tai's partner Digimon in the first Digimon season, Agumon eventually gains the ability to digivolve to his champion form of Greymon and then to his Ultimate form of MetalGreymon and then to his Mega form of WarGreymon.The next main Agumon appears in Digimon Data Squad as a main partner to Marcus, Marcus' Agumon eventually gains the ability to digivolve to his Champion form of GeoGreymon and then to his Ultimate form of RizeGreymon and then finally his Mega form of ShineGreymon.
Mega Level
you have to be a certain tamer rank when you are that rank congratulations you can digivolve into mega
you need to have the gold tamer rank to digivolve to mega and raise them
No, Ornismon is not currently known as Kokatorimon's Mega form however some of his Mega formswould include Ghoulmon and Machinedramon but only if he digivolves into his Ultimate form of Megadramon first additionally if he digivolves to Sinduramon then he would be able to digivolve with Valdurmon. Machinedramon, a Mega level Digimon can also digivolve to 3 other Mega-level Digimon which are Millenniummon, HiMachineDramon and Chaosdromon, Milenniummon can digiviolve further to Moon=Milenniummon and Chaosdromon can digivolve further to the next Mega level form of Apocalymon.