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In warhammer 40k can a...?
Mega gargant be used in apocalypse battles or can you only use it in epic Armageddon
The flexibility of the Apocalypse rules mean that there's nothing you can't use. I know that the guys at Bell of Lost Souls have written well-regarded datasheets for a host of mighty warmachines, including the Great Gargant. Using these as a guideline, you should be able to come up with a datasheet for a mega-gargant easily enough.
I suppose the question has to be asked: do you have a mega-gargant at 40k scale to use in games of Apocalypse?