I suggest that pokefind never adds mega evolutions , strange suggestion I know. I know a lot of young players will hate for this but it is actually a reasonable request. For those of you have been playing pokemon for a long time such as myself would know for the generations of pokemon nothing changed , every few years the same pokemon like game would come out with new pokemon untill gen 6. Game freak introduced mega evolutions to change up the game and it was a permanent thing as we got z moves in gen 7. Now if you look closely you can see that mega evolutions are not a set thing. Gen 2 pokemon mostly don't have mega evolutions. If pokefind were to add megas it would be stupid . You would want to skip gen 2 straight away if everyone used megas and gen 4. Maybe add mega evolutions when you've added all generations but that is do far away it won't be an issue.
Since mega evolutions were released in generation 6, I doubt that they will add them anytime soon if ever.