I think Z- moves can be used as a Move of OHKO and can be acquired by beating a specific gym Or Trials But again who doesnt has Spammers of These moves as they will be OHKO (whole result Z moves shouldnt be introduced) And about live battle showdown will be way more hard to Handle and manage and as per my pov season battles are quite good, ( I dont think there is a need of World Coronation League) and The event of Gigantamax would be the Idea of future And just leave it to mods and same with Dynamax (But I dont think it ll be there as these are too complex to fix it in a battle). About new Mega evolutions, they might get some more as there are already some fake ones and I have no suggestions for Wonder Trade, Im not quite good with the Trading Of Avatars, but can agree with trading of items maybe
I agree with u dude and @sanathandsaathvik how can someone give a good feedback for a 95•/• non usable ideas since its not a matter of good for negative ( just take it as tit for tat)