I am going to have to disagree with both.My reasoning is this.
Sylveon.Sylveon isnt a fantastic pokemon in this metagame but it is a great one.It certainly covers some of his weaknesses with Hidden Power ground + HV + psyshock but they really dont do that much damage.Due to the rise in popularity of Gardevoir,a better fairy IMO and char y sylveon is quite useless.Heatran walls the specs set unless its locked into to HP ground.Also Kang destroys Sylveon.And Aegis is the Nr.1 Counter to Sylveon with HP ground or no HP ground.
As for Mawile.Allthough it is my favourite mega it doesn t have a great place in this metagame due to the fact that heatran + zard y exist and its very hard to deal with them even with right support.Also landorus t destroys it.I nominated mawile for A- a while back but i dont think the metagame has changed enough and i think that the one who opposed me was right about why it shouldnt be.
OK,so i kind of have to agree with you.I have seen gardevoir-mega being used more on battle spot these days,but nothing beats the kang+sylveon opening.I think sylveon is a weaker version of gardevoir mega in a way,but at least sylveon doesn't waste the mega slot.But,landorus-T and mawlie is a reasonable opening,and mawlie with protect deals with heatran and zard-y,as mawlie doesn't have to worry about a EQ hitting it.





