>>25129843They are blatantly marketing tools, which the games have gotten really bad about since Hoenn/Sinnoh
They disbalance the game. "Oh, Beedrill is good now!" Except you can only use one mega so why would it ever be Beedrill
The megas are all over designed and basically just a normal Pokemon plus every edgelord technique you can imagine (spikes, zigzags, ANGRIER)
A small handful of them are decent and should have been regular evolutions. It's also implied that these guys are now cut off from traditional evolutions.
Another way to make the games easier without balancing the games for challenge
