So hypothetically, let's say GameFreak gave you an offer. You have to choose one mega evolution to completely remove from existence, but a regular evolution would be created for the Pokemon instead. You have no control over what the evolution is like. This applies to all Pokemon - if you remove Mega Mewtwo (you'd have to remove both formes), there would be a Mewtwo evolution. If you remove Mega Sceptile, there would be a Sceptile evolution. Make your choice!
I vote Mega Pinsir because counterparts.
I vote Mega Pinsir because counterparts.