No, he is the Mega form of Golemon as the name implies.
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
Actually Culumon can digivolve and its mega form is Gankoomon! So yes it is!
Mewtwo can Mega Evolve into either Mega Mewtwo Y or Mega Mewtwo X.
No, Bacchusmon is not ToyAgumon's mega form however it can eventually become HiAndromon and Cranimon which are both Mega forms in the event of ToyAgumon slide digivolving into ShadowToyAgumon.
mega minute
mega hertz
No, currently Delphox cannot Mega Evolve or evolve into any other form.
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.
Mega cat dimension
The only confirmed thing about her evolutionary line is that she is an alternate Mega for Lilimon.
Mega cycles per second