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The funny thing about VGC, is that normal Garchomp wasn't notably more successful than Mega Garchomp in direct comparison.
pre-gen6 VGC: Mega Chomp didn't exist
VGC 2014: Mega Garchomp + Tyranitar was super good and regular Garchomp was the hard hitter of choice in regular "good stuff" teams.
VGC 2015: Neither of them was good, because Lando-T was around.
VGC 2016: see above and add Kyogre/Xerneas to that list
VGC 2017: Garchomp is ridiculously popular, but Mega Garchomp isn't legal, so once again moot point. (It would probably be amazing with Gigalith.)
What it boils down to; Mega Chomp is a build around Heavy Hitter and it performed reasonably well; Sandforce Rock Slides under Tailwind really hurt and it just obliterated things with Earthquake.
Meanwhile, normal Garchomp is easier to use, because it just needs to be there and isn't dependent on the meta as hard (the Politoad+Lucicolo hype hurt sand).
Mega Garchomp doesn't work in singles; It requires a sand-setter, speed control and a way to deter intimidate, which is a lot easier with a slot next to it (think about why Trick Room is bad in singles but utterly busted in VGC).
