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So apparently there is something like this:
STRM_BGM_VS_FLARE
STRM_BGM_VS_FLARE_BOSS
in OR/AS Demo Sound Listing. I don't believe that these are just XY leftovers, because there is no other track from XY. Still, who knows, but let's suppose, that we encounter Team Flare in Hoenn - what is their purpose?
Also interesting to note is the fact, that Lysandre appears in Special Mega anime episode (I know, that anime rarely is connected to game's canon, but there are some chances), where he intends to discover the secrets of origin of mega evolution.
What do you think?