Can we drop Malamar to E, then create E?
Goodra should definitely be A. BLABALBALBALBA
Latios and Hydreigon wish they had access to moves like Fire Blast and Focus Blast (Latios) or Thunderbolt (both)
Don't compare Goodra to Latios or Hydreigon. They play different, with Latios being predominantly a Draco Dropper or a Defogger and Hydreigon being an effective mix mon that breaks
both Heatran and the Blobs. Hydreigon got exactly the tools it needs, Draco-FireBlast-Superpower-EarthPower/Earthquake/U-turn, and Latios only really misses a fire type move to handle Ferrothorn. Also, Latios has Tbolt.
Goodra is quite frankly not that good. 110 SpA leaves much to desired (considered how even fucking Mega Absol has higher SpA), 80 speed is pretty much horrible as it has no way to boost it, and the fact that Physical Attackers shit all over it doesn't help. It's abilities are pretty much bad (rain nerf killed Hydration), and without recovery options.. well, it's going to whittle down. Take a look at the other A rank mons and then take a look at Goodra. How does Goodra combat them? I can help by going down the list one by one
Greninja U-turns out on the switch
Excadrill outspeeds and hits with an EQ (and excadrill is also a very competent user of Assault Vest, meaning Fire Blast won't KO.. and without Assault Vest it still can survive
Deoxys-D sets up hazards like a fucking (BAN ME PLEASE)
Gengar is forced out
Keldeo simply Secret Swords the dragon. It has the bulk needed to take a Tbolt, if it does carry that
Azumarill clicks Play Rough
Charizard is forced out unless it runs the Mix set
Mawile clicks Play Rough (Fire blast doesn't KO)
Lando-T clicks EQ as it survives any move.
Ttar laughs
Scizor is outsped and KOd by Fire blast, so it is forced out.
Dragonite goes for a DD T1 and you are kind enough to activate it's Policy. Oops.
Ferro has a chance at surviving a Fire Blast, actually. Still no reason to keep it in.
Kyurem-B laughs
Terrakion laughs
Bisharp Knock Off's, and no more special bulk.
Mamo drops some crashing icicles
Gyarados sets up
Conk absolutely sponges any and all moves
Gliscor can sub up until Muddy water misses, and then it can Toxic it. Other sets needs to switch
Chansey laughs like a mufugga
Mandibuzz laughs and knock offs
So, in other words it comes out well in 3, maybe 4, out of 24.
It fits perfectly well where it is.