Now that Greninja has been kicked upstairs, I can envision Adamant Mega Lopunny becoming more viable, as has been mentioned previously. This brings me to wonder if this goes for Modest Mega Manectric as well; IIRC most Jolly Talonflame don't run max Speed and there's things Mega Mane is outsped by even
when Timid, such as Mega Sceptile, Mega Aerodactyl and Scarfers. With a Modest nature, Mega Manectric still hits 369 Speed, while the extra power makes it noticeably stronger and more capable of cleaning late-game. I dunno, just thinking here.
Next up,
Mega Gardevoir must stay in A+. I really see no reason to drop it. Sure, Mega Gardevoir may be physically frail, but that didn't stop Greninja from dominating the metagame. What really keeps Mega Gardevoir in A+ is that it's basically Stall's nemesis: extremely high special power (base 165 SAtk + Pixilate Hyper Voice), access to Taunt to stop stallers in their tracks and a great matchup against many Pokémon of the playstyle, notably Mega Sableye and Mega Slowbro. That aside, Mega Gardevoir has access to Will-O-Wisp to nerf its checks and counters, and generally sports enough power to hit anything hard on the switch. Between its coverage and power, nothing likes to switch in on any of Mega Gardevoir's moves, including supporting moves.
Here's what I'd like to say to people bitching about its Speed: There's a lot of Pokémon that Mega Gardevoir is already outsped by, so it can easily run Modest to gain extra power. Self-explanatory is that most Stall Pokémon are slow and bulky, so Mega Gardevoir doesn't really
need the Timid nature in most cases. It hits absurdly hard, has great coverage,
enough Speed and more than one ways to screw over its checks. It may only have a single set, but it's extremely good at what it does.
Sure, you can run a different special wallbreaker, like Landorus-I. I get that. But it seems many just overlook the fact that
a Mega Evolution is chosen depending on what the team requires or a team is built around a Mega Evolution. Among Mega Evolutions, Mega Gardevoir is the #1 wallbreaker and Stall crusher. This argument can be made for almost every Mega out there, to be fair.
So with all that out of the way,
Mega Gardevoir should remain A+.
Other changes I agree with for previously stated reasons:
C+ -> B- | I think Serperior overall has more use than most of C+, hence why it should be B-, but no higher than that. It's too flawed. Yes, its main STAB doubles its SAtk after a single use and keeps stacking, which is phenomenal, but Serperior will always be walled by
something depending on which HP it runs. It's not a bad Pokémon at all, it just has a hard time unleashing its full potential.
B- is good for it.