Small nom here:
Diancie-Mega A --> A-
I've been using this thing quite a bit lately in a new team and I have to say, it really hasn't done much at all. It's main niche blocking hazards is very important in this meta but it really doesn't do it particulary well, as it is threatened by the best hazard setters. Even though it wins 1V1 against most of them, it still isn't relaible as if you mispredict and try to switch it in to block SR it can just get EQ'd or earth powered by lando/heatran. It loses to Ferro without HP Fire and it needs some chip for that anyway and it is destroyed by Gren so can't really prevent it spiking. It can't safely switch in to any of the relevant hazard setters right now, not even Pex as it can't take scalds well. Outside of magic bounce, it doesn't have many notable features as it's speed tier is not brilliant this gen and although it is reasonably powerful, it is not particularly difficult for offense to handle and fatter teams don't really have much trouble against it either. It's generally the first thing to be sacked when I get into a spot of trouble and often hasn't done anything notable beforehand. I'm not saying it's terrible right now, but it certainly isn't on the same level as the other A mons, such as Gren or Clefable. It fits in much better with the likes of Keldeo and Tangrowth down in A- IMO.
Diancie-Mega A --> A-
I've been using this thing quite a bit lately in a new team and I have to say, it really hasn't done much at all. It's main niche blocking hazards is very important in this meta but it really doesn't do it particulary well, as it is threatened by the best hazard setters. Even though it wins 1V1 against most of them, it still isn't relaible as if you mispredict and try to switch it in to block SR it can just get EQ'd or earth powered by lando/heatran. It loses to Ferro without HP Fire and it needs some chip for that anyway and it is destroyed by Gren so can't really prevent it spiking. It can't safely switch in to any of the relevant hazard setters right now, not even Pex as it can't take scalds well. Outside of magic bounce, it doesn't have many notable features as it's speed tier is not brilliant this gen and although it is reasonably powerful, it is not particularly difficult for offense to handle and fatter teams don't really have much trouble against it either. It's generally the first thing to be sacked when I get into a spot of trouble and often hasn't done anything notable beforehand. I'm not saying it's terrible right now, but it certainly isn't on the same level as the other A mons, such as Gren or Clefable. It fits in much better with the likes of Keldeo and Tangrowth down in A- IMO.