Hi,

 

no idea if this suggestion was already made, but I couldn't find anything.

Similar to the upgrade of mounts to mega mounts, I suggest you add something to upgrade your follower sprite. That way people can have Mega Charizard or whatever they prefer follow behind them. I don't know if it's too hard to code, but you could do it so it only works when your pokemon is holding a mega stone. I think it would be a cool nice little feature.

 

+1

And it doesn't involve that many Pokemon either, so it shouldn't be too much hassle compared to doing it with multiple generations.

And as you said, it should only trigger if an held item, being the respective mega-stone is held by the Pokemon.

Whether it transforms if you equip it or if it transforms by the next route/map switch, shouldn't matter too much IMO.