Punchshroom
FISHIOUS REND MEGA SHARPEDO
With a spread of 248 HP, 16 Def @ Bold (to take Golurk's attack), 56 Speed (to outrun Golurks), and 188 SDef, Mandibuzz is surviving a huge variety of attacks.Out of curiosity, which EV spread are you referring to in that list of attacks Mandibuzz can survive? Because it seems to me that no one Mandibuzz set can survive all those hits. This is what maximum SpD Mandibuzz takes from +2 Gorebyss and Sun Charizard:
+2 252 SpA Life Orb Gorebyss Ice Beam vs. 248 HP / 252+ SpD Mandibuzz: 367-432 (86.76 - 102.12%) -- 12.5% chance to OHKO even before rocks.
252 SpA Solar Power Charizard Fire Blast vs. 248 HP / 252+ SpD Mandibuzz in sun: 291-343 (68.79 - 81.08%) -- 50% chance to OHKO after Stealth Rock
This same Mandibuzz would take...
252+ Atk Choice Band Sawk Stone Edge vs. 248 HP / 0 Def Mandibuzz: 336-396 (79.43 - 93.61%) -- guaranteed OHKO after Stealth Rock
252+ Atk Choice Band Iron Fist Golurk Ice Punch vs. 248 HP / 0 Def Mandibuzz: 300-354 (70.92 - 83.68%) -- 68.75% chance to OHKO after Stealth Rock
252 Atk Toxic Boost Zangoose Facade vs. 248 HP / 0 Def Mandibuzz: 301-355 (71.15 - 83.92%) -- 68.75% chance to OHKO after Stealth Rock
+2 252 Atk Life Orb Samurott Waterfall vs. 248 HP / 0 Def Mandibuzz: 273-321 (64.53 - 75.88%) -- 6.25% chance to OHKO after Stealth Rock
and wouldn't have the speed to outrun any of them, which means it could die or be forced out even without rocks. It certainly can't take any of them after an ice beam, and it would be hard-pressed to survive after even a LO Sun Weather Ball from Victreebel (~40% damage). Even if it manages to survive and Whirlwind out its attacker, what's it going to do at 25% health? Even Scarfstrika can deal that. 252+ Attack Ninjask can do that. If it forces something fast into play, it's still dead meat or beating a hasty retreat.
Contrarily, a Mandibuzz that can reliably beat those physical attackers is going to get flattened by both Charizard and Gorebyss. I have no idea when any Mandibuzz could take any two of these attacks in succession: many of these attackers could get a 2HKO even if Mandibuzz manages to roost. Moreover, if it's Roosting it's not hitting back with Foul Play; it's just going to get worn down.
+2 252+ SpA Gorebyss Ice Beam vs. 248 HP / 188 SpD Mandibuzz: 358-422 (84.63 - 99.76%) -- guaranteed 2HKO
252 SpA Solar Power Charizard Fire Blast vs. 248 HP / 188 SpD Mandibuzz in sun: 337-397 (79.66 - 93.85%) -- guaranteed 2HKO
252+ SpA Expert Belt Eelektross Thunderbolt vs. 248 HP / 188 SpD Mandibuzz: 305-362 (72.1 - 85.57%) -- guaranteed 2HKO
252+ SpA Life Orb Victreebel Weather Ball (100 BP Fire) vs. 248 HP / 188 SpD Mandibuzz in sun: 169-199 (39.95 - 47.04%) -- guaranteed 3HKO
252 SpA Life Orb Jynx Ice Beam vs. 248 HP / 188 SpD Mandibuzz: 322-382 (76.12 - 90.3%) -- guaranteed 2HKO
252 SpA Life Orb Haunter Thunderbolt vs. 248 HP / 188 SpD Mandibuzz: 216-255 (51.06 - 60.28%) -- 89.06% chance to 2HKO
+2 252 SpA Misdreavus Thunderbolt vs. 248 HP / 188 SpD Mandibuzz: 270-318 (63.82 - 75.17%) -- guaranteed 2HKO
252+ Atk Choice Band Sawk Stone Edge vs. 248 HP / 16+ Def Mandibuzz: 300-354 (70.92 - 83.68%) -- guaranteed 2HKO
252+ Atk Choice Band Iron Fist Golurk Ice Punch vs. 248 HP / 16+ Def Mandibuzz: 268-316 (63.35 - 74.7%) -- guaranteed 2HKO (not a KO after SR)
252Atk +2 Torrent Samurott (+Atk) Waterfall vs 248HP/16Def Mandibuzz (+Def): 72% - 85% (307 - 363 HP). Guaranteed 2HKO.
252Atk Life Orb +2 Scolipede (Neutral) Megahorn vs 248HP/16Def Mandibuzz (+Def): 80% - 94% (340 - 400 HP). Guaranteed 2HKO.
252+ Atk Flying Gem Drifblim Acrobatics (110 BP) vs. 248 HP / 16+ Def Mandibuzz: 184-217 (43.49 - 51.3%) -- guaranteed 3HKO
252 Atk Guts Swellow Facade vs. 248 HP / 16+ Def Mandibuzz: 220-261 (52 - 61.7%) -- 97.66% chance to 2HKO
252+ Atk Silk Scarf Kangaskhan Double-Edge vs. 248 HP / 16+ Def Mandibuzz: 178-211 (42.08 - 49.88%) -- guaranteed 3HKO
Mandibuzz shows her impressive bulk by surviving nearly every attack you'd thought would OHKO/2HKO her. I misphrased myself again, but through the calcs that I myself posted you'd understand what I meant is that Mandibuzz can be EVed to take some of the strongest attacks in the tier while even surviving certain SE hits, then respond in kind, kind of like how support Musharna operates, except with much of Golbat's movepool.
Here's when I began to notice Musharna's and Mandibuzz's matchups against the tier's threats. Musharna can use Thunder Wave and can completely eliminate the threat's danger level; all Mandibuzz can do to stop a threat is Whirlwind or Foul Play which tends to not be enough against the special threats.
However, Musharna struggles a bit more with the greater physical threats, either due to the inability to paralyze them (Golurk, Zangoose, Swellow), or they threaten a OHKO (Samurott, Scolipede) and Psychic often fails to stop these threats in time. Mandibuzz on the other hand can use Foul Play to potent effect, taking a hit from these monsters and straight up owning them with Foul Play, or even Taunt/Whirlwind away Braviary's or Klang's boosts or Subs, something Musharna is unable to do. Even Sawk, who resists Foul Play, gets OHKOed if he is wielding Choice Band and used Close Combat at least twice prior (one to KO something, one more on Buzz).
While a good number of teams can find it tricky to work around Musharna's Thunder Wave (most status absorbers and Ground-types bar Golurk find it hard to beat Musharna itself), the same can be applied for Mandibuzz's Foul Play, as most pokemon who shrug off the attack like nobody's business find themselves quickly shut down by Taunt + Toxic.
The SR weakness still limits Mandibuzz, but Mandibuzz can still hold her own against the meta's top threats: if those calcs show anything, it's that anything weaker is usually not enough to beat Mandibuzz. While Musharna offers Heal Bell support (and cures itself of status, a huge boon), Mandibuzz is much more useful against stall provided she doesn't get statused. While most support Musharna are invested in Def primarily for Sawk, Mandibuzz can either lean towards Def for better matchups against physical sweepers that Musharna can't stand up to, or SDef to combat the special attackers that shrug off Foul Play. I myself may try a more physically inclined spread after looking at those calcs.