Cheryl.
Celesteela is Life
I disagree with Sea monkey to S unaware clef walls it it struggles with offensive teams and fast electrics are sort of common now that Lando I is banned personally i am against it being A+ in the first place but i guess its fine there but no S rank 4 itI'd like to make a nomination that while I think may be a stretch is worth the discussion alone
Manaphy -> S
Reasoning:
The definition of an S rank mon is, "These Pokemon are able to perform a variety of roles very effectively, or can just do one extremely well" and so I believe is the case with Manaphy. With the loss of Lando-I, balance has become much more viable and to a smaller degree bulky-o and even stall have as well. Manaphy does nonetheless have the ability to beat all 3. Stall especially though, is absolutely destroyed. Manaphy to many people is the first Mon you think about when needing an answer for stall. As shown in the calc below, Manaphy can even take on Unaware Clefable to an extent. Manaphy's ability to Tailglow and absolutely nuke slower teams is unrivaled. Manaphy more or less picks Tail Glow and 3 moves each of which allowing it to narrow down its checks whether it be tg + 3 attacks, tg+ rain dance + 2 attacks, tg + rain dance + rest, or even rain dance cm. Base 100 stats across the board provides for respectable defenses, and while the benchmark of speed may have gone from 100 -> 110 from XY to ORAS, base 100 speed can be invested in many different ways to pick what mons it threatens. Remaining EV's being thrown in to add onto the aforementioned respectable bulk.
In conclusion, I feel that even though Manaphy may not be the best S rank mon, it's worthy of the placement being as it 100% fits the definiton of doing one job EXTREMELY well, by absolutely trashing slower/bulkier playstyles and changing the mons that stop it by its commendable moveset.
Calcs:
vs. Physical Unaware Clefable in rain
252 SpA Manaphy Scald vs. 252 HP / 4 SpD Clefable in Rain: 178-211 (45.1 - 53.5%) -- 2% chance to 2HKO after Leftovers recovery
vs. Special Unaware Clefable in rain
252 SpA Manaphy Scald vs. 252 HP / 252 SpD Clefable in Rain: 141-166 (35.7 - 42.1%) -- 90.4% chance to 3HKO after Leftovers recovery
+6 2hko's Blissey in rain
+6 252 SpA Manaphy Scald vs. 0 HP / 252+ SpD Blissey in Rain: 382-450 (58.6 - 69.1%) -- guaranteed 2HKO
even max hp max spdef blissey
+6 252 SpA Manaphy Scald vs. 252 HP / 252+ SpD Blissey in Rain: 382-450 (53.5 - 63%) -- guaranteed 2HKO
1 Tailglow and Ferro is dead
+3 252 SpA Manaphy Hidden Power Fire vs. 252 HP / 168 SpD Ferrothorn: 416-492 (118.1 - 139.7%) -- guaranteed OHKO
Spdef Skarm is still mutilated (especially if rocks are up)
+3 252 SpA Manaphy Scald vs. 252 HP / 252+ SpD Skarmory: 246-289 (73.6 - 86.5%) -- guaranteed 2HKO
Mega Slowbro lol
+3 252 SpA Manaphy Energy Ball vs. 252 HP / 0 SpD Mega Slowbro: 492-580 (124.8 - 147.2%) -- guaranteed OHKO
Let's give Mega Bro a CM to be kind
+3 252 SpA Manaphy Energy Ball vs. +1 252 HP / 0 SpD Mega Slowbro: 328-388 (83.2 - 98.4%) -- guaranteed 2HKO
Bulky Lando-T can't live ice beam (no boosts) and gets hit hard and potentially burned by Scald
252 SpA Manaphy Ice Beam vs. 252 HP / 0 SpD Landorus-T: 396-468 (103.6 - 122.5%) -- guaranteed OHKO
252 SpA Manaphy Scald vs. 252 HP / 0 SpD Landorus-T: 264-312 (69.1 - 81.6%) -- guaranteed 2HKO after Leftovers recovery
vs. AV Conk
+3 252 SpA Manaphy Scald vs. 0 HP / 236 SpD Assault Vest Conkeldurr: 190-225 (54.1 - 64.1%) -- guaranteed 2HKO
vs. Conk with AV knocked off
+3 252 SpA Manaphy Scald vs. 0 HP / 236 SpD Conkeldurr: 286-337 (81.4 - 96%) -- guaranteed 2HKO
vs. AV Conk with Psychic (for lulz
+3 252 SpA Manaphy Psychic vs. 0 HP / 236 SpD Assault Vest Conkeldurr: 286-338 (81.4 - 96.2%) -- guaranteed 2HKO
vs. Mega Sableye
+3 252 SpA Manaphy Scald vs. 252 HP / 0 SpD Mega Sableye: 241-285 (79.2 - 93.7%) -- guaranteed 2HKO
vs. reg Clefable
3 252 SpA Manaphy Scald vs. 252 HP / 96+ SpD Clefable: 244-288 (61.9 - 73%) -- guaranteed 2HKO after Leftovers recovery
max spdef clefable still gets 2hko'd
+3 252 SpA Manaphy Scald vs. 252 HP / 252+ SpD Clefable: 211-249 (53.5 - 63.1%) -- guaranteed 2HKO after Leftovers recovery