I just want to clarify some things on these Pokemon; Ludicolo I have never saw a Specially Defensive Ludicolo on Bulky Offense, since most of the time you can use Roselia to check Water-types and Rain teams while also filling the role of a spiker (and I also really don't think SpDef Ludicolo should be used on Bulky Offense). With that in mind I won't add it there unless it gets more support. Talking of checking Water-types: Ludicolo has problems against the two Pokemon you listed that it checks, Samurott and Simipour. The former carry Megahorn quite a lot in this metagame to KO Jynx and 2HKO Musharna/SpD Ludicolo, while the later can run an effective physical set with Acrobatic/Waterfall/Substitute/Endeavor that can deal with its usual check and counter and use Endeavor when its health gets low against walls to keep them at low health, which can be dangerous when used correctly. Specially Defensive Ludicolo isn't a Tank or a Utility Pokemon; it is mostly used to check Rain teams which are quite dangerous in this tier while also being able to take strong special hits with its amazing typing and bulk on the special side. I'll add it to Stall and Balance though, as it can check some dangerous Pokemon such as Ludicolo itself and some other Rain abuser. Cacturne I'll add it to Offense and Bulky Offense since Balance usually prefer a Spikes user able to last longer than 2-3 turns. Golbat Again, like Ludicolo, I don't see Golbat much on Bulky Offense teams since they usually use the raw power of the multiple wallbreaker in the tier to break cores, and to be completly honest, Balance and Stall are probably the two playstyle where Golbat can see good uses thanks to its amazing typing and support movepool, only really facing competition with Mandibuzz. Rotom-Spin/Rotom-Frost I wouldn't say they reliably revenge kill Carracosta as they take a minimum of 64% from Adamant +2 Aqua Jet with Life Orb :). While they are still decent revenge killer, they face a lot of competition with Jynx, Primeape, Charizard, and Tauros, I will still add them though! Adding to that, their Expert Belt set is amazing in this metagame to lure a good amount of their usual checks (ex: Golem switching on a Volt Switch just to get OHKO by Hidden Power Grass, Air Slash the Grass-types who think you are locked on Thunderbolt..) so I will add Rotom-S/-F in Bulky Offense under Utility as Expert Belt is mainly a lure set. Feel free if anything mentionned in this post is false; I just woke up and might have said wrong facts I'll update later!