One of the ideas i came up with would have been to implement fake megas in reborn.
Indeed, some megas are missing in the original games: starters, raichu, etc ...
I know that this idea would take a lot of time for developers to implement, but perhaps the forum could attend as he had done for shinies: Determine what might be added, find an interesting design on the web (and ask permission its author to use) or create it, and then deal with stats and sprites.
What do you think ?