Agreeing with Jay that regular Megas should use Abomasite, X Megas should use Charizardite X, and Y Megas should use Charizardite Y. Thanks so much 00001111a for working on coding!I am currently working on implementing this as mod for Showdown here on my Github Repo. If anyone wants to help on development PM me. However, I cannot be able to host it because I don't have time to have a server. If anyone volunteers to host this please follow the instructions listed on the README file.
btw, nightsitter on acestriker19 's original thread it said that every Pokemon can mega evolve with Abomasite, but now we have Pokemon that have 2 megas (arcanine, articuno,...) what will our mega stone be for these pokemon?
Mega Mantine, your Suicune submission only added 90 points to the BST, so I threw 10 more into attack. I hope this is okay with you.
Tagging Mew King because I think he's still doing the slates. Take your time if you need it.