What?
A-? Seriously, people at Smogon love to overestimate things, but this is too much.
Seeing as the thing probably wont go higher than UU, I cant see how this guy is a threat.
A shit movepool which suffers a decent 4MSS clause and a good amount of checks (MVenu, Skarm (roar, Counter, etc.) Clefable, Quag, GK MMeta, Mew (if not running crunch) etc. he isnt that amazing. I understand he looks good on paper, but you think its like a god.
If it runs Crunch, then it cant take on Priority users and is weak to Azu, Keldeo,Bulky MZor With Superpower/Knock Off, MAlt, and Skarmory again.
If it runs Aqua Jet, its coverage is laughable and is checked/countered by basically every grass and water type and the pokemon listed above.
If it runs Ice Fang, read above except change Grass to Water types.
Besides, No recovery sucks.
It has a lot of competition against other DDers in the way of it. I'd rather use MDos/CharX/MAlt due to their bulk, coverage, and recovery options. If i wanted to put it somewhere, B seems good for it.
Where should I start...
1. Feraligatr and Gyarados share the same amount of checks. Mega-Gyarados can beat Skarm easier with Taunt and Venu with Ice Fang but that's why it is A+. Clefable is 2HKO if you run adamant. MegaMeta gets outsped (after a boost) and KOed by Crunch.
2. With Crunch it can't take priority users? First Crunch is standard and should ALWAYS be used, second it cannot take on Azumarill anyways, Altaria gets destroyed by Ice Punch and other checks that can survive a boosted attack have to be a bit weakened. That is normal for every set up Pokemon. Besides, Gyarados faces the same problem.
3. Water + Dark is not a laughable coverage. Taunt + DD/Sub Mega-Gyarados can tell you that.
4. It should NEVER use Ice Fang.
5. A lategame-sweeper doesn't need recovery. Otherwise Metagross wouldn't be in S.
6. I don't like to repeat myself, but all the Pokemon you mentioned are megas.
I know it was bold from me to nominate it to A-, but besides "it shouldn't start there" I didn't read many reasons why it should be lower than Gyarados. I know it can set up easier but Feraligatr on the other hand has more power and other trade-offs. Is this really the only reason? If yes, I am not convinced yet.