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It's hard to consider any of the ORAS Megas too forgettable since they were promoted so hard pre-release. Unlike the XY Megas where half were kept secret until release.
There's no Megas I've really forgotten about, but it does feel like I see little mention or art of Mega Ampharos, Heracross, Tyranitar, or Aggron compared to how popular their base forms are. And for M-Ampharos, compared to how much people memed about its hair when it was first revealed.