Mienshao's niche over other fighting types is so small that I don't think it really needs/warrants a write up. There are so many good fighting types right now - Keldeo, Terrakion, Mega Lopunny, Mega Medicham, Breloom, etc - that it seems to me I would have a hard time justifying the use of Mienshao. It does have some cool options at its disposal with Swords Dance/Knock Off/U-Turn and the ability to go mixed to hit Lando/Chomp with HP Ice, but its niche really ends there to me. It's plagued by a terrible defensive typing, Mega Beedrill levels of bulk (see calc below), and a speed tier that is pretty shit for such an offensive mon. Also when you look at other fighting types in the tier, a lot of what makes them shine are their great secondary typings and STABs that allow them to blow through fighting resists - something that Mienshao doesn't have. So yeah, I don't think it deserves a write up when it's very likely that another fighting type can do the job better.
0 Atk Landorus-T Earthquake vs. 0 HP / 0 Def Mienshao: 225-265 (83 - 97.7%) -- guaranteed 2HKO
Likewise, I'm against giving Specs Goodra a write up as well. I get that it's a pretty cool mon in this meta where Volcanion is on every other team, but I don't think its usefulness will last very long. Even with Choice Specs, this thing only hits marginally harder than LO Latios, and if you run Choice Specs on Latios (which is a perfectly viable set) Latios actually hits harder even with a Timid nature. Once you take into account the 50 or so mons Latios outspeeds that Goodra doesn't, Goodra's niche starts to shrink really quickly. In terms of coverage, the only thing it has on the Latis is Sludge Wave/Bomb and Flamethrower/Fire Blast, but HP Fire Lati is extremely common and gets the job done in most cases. Specs Goodra also runs into issues in being extremely prediction reliant and becoming set up fodder once it has locked into a move, which is pretty undesirable. Finally without bulk investment or an Assault Vest, Goodra becomes quite easy to revenge kill especially when you consider its low speed and lackluster physical bulk. Hell, it's almost as vulnerable to Pursuit trapping as the Latis, considering ScarfTar's Pursuit is a 2HKO if you switch. Overall, there are just way better options out there than Specs Goodra - Specs Lati, CM Mega Lati, Specs Kyu-B, etc. Goodra's only real niche is its insane special bulk boosted by an Assault Vest and strong and somewhat unpredictable coverage options. It becomes much easier to beat once its loses its bulk and ability to switch moves.
252 SpA Choice Specs Goodra Draco Meteor vs. 0 HP / 0 SpD Keldeo: 309-364 (95.6 - 112.6%) -- 75% chance to OHKO
252 SpA Life Orb Latios Draco Meteor vs. 0 HP / 0 SpD Keldeo: 302-356 (93.4 - 110.2%) -- 62.5% chance to OHKO
252 Atk Tyranitar Pursuit vs. 0 HP / 0 Def Goodra: 91-108 (28.3 - 33.6%) -- 97.1% chance to 3HKO after sandstorm damage