1. I can concur with Alomomola belonging in D Rank. I tried using it in tandem with Tangrowth a few times instead of Slowking for experimental purposes (to see if Alomomoongus would be fine in RU as well; did the inverse with Amoongus being fine as a pardner for Slowking), and deeply regretted it;
Wishtect is stupid. It surprises the average player maybe once, but under the right circumstances it gives a savvy player two boosts of a setup move, while Alomomola recovers itself only to die to the setup sweeper. If not for Regenerator and Wishtect, I'd be suggesting Alomomola go straight to E Rank (and actually would propose that anyway; even with Regenerator, Alomomola does nothing). However, since its traits are palpable for NU, but not for RU, it is fine at D Rank to me.
2. Lanturn as A Rank to S Rank? I'm on the fence in regards to this. I personally think Slowking is a better Special Wall (especially thanks to Regenerator and also having offensive options via Trick Room and Nasty Plot). However, Lanturn's Heal Bell has been invaluable countless times. Also, Water/Electric is a really good dual-typing.
I might leave Lanturn going from A Rank to S Rank to other people, honestly.