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Omega Ruby and Alpha Sapphire are revealed and new Mega Evolutions along with them. Flygon's popularity among Hoenn's fans made it a surefire candidate for its long-overdue redemption in the form of a Mega Stone. Altaria and Salamence were among the first batch of Mega Evolutions to be revealed, and their shared Dragon typing - along with the later reveal of Mega Rayquaza, the fourth Dragon in Hoenn, convinced fans that Mega Flygon was sure to come. In addition, two new NPCs of importance Lisia and Aarune, who used Altaria and Flygon, were introduced. Lisia even used a Mega Altaria! There was no way that Flygon, one of the mascots of Gen III, was going to be left out this time. There was no way.
More Mega Evolutions are revealed, and when Pokemon such as Pidgeot and even Beedrill are given Mega Stones, Flygon fans are convinced that if these Pokemon were acknowledged by Game Freak, who weren't even introduced the generation that the remakes were going to be in, surely Mega Flygon would come. Maybe it wasn't going to be revealed - there were Mega Evolutions in X and Y that weren't, after all - maybe it would be a post-game find. After all, with the list of grievances that Game Freak has committed against Flygon, surely they wouldn't drag it this far.
When the Omega Ruby and Alpha Sapphire demo comes out, datamining the demo revealed two very opposing pieces of information regarding the fate of Flygon. The first one was that Vibrava now learns Boomburst as a level-up move, an extremely exclusive move only given to a select few Pokemon. Flygon by itself was a very unusual Pokemon to be able to use Boomburst, but what if - just what if - it got a sound-related Mega Evolution that made sense and could make use of the new move? After all, Lopunny could learn High Jump Kick for its Mega to use, right?
The second piece of information was that Aarune's Flygon held... a Normal Gem.