Regarding Diggersby: Kind of mixed feelings tbh. Pretty borked and easy to spam, but I liked the bunny a lot. Perhaps one day it can grace its presence in UU and not completely flip the meta on its head....
Regarding Scolipede: This is going to be interesting to say the least. As we have seen in Poison/Bug types (Venomoth), typing is very useful in the current meta and lets it set up on numerous things. Hazards are a pain, but let's keep in mind how many Defoggers and Spinners in the tier, regardless of how effective it is at setting them up (Starmie, Donphan, Tentacruel, Crobat, Forrertress to just name a few). So, hazard-wise it's going to be tough, but could be manageable. Speed Boost in itself isn't broken just look at Combusken and Ninjask (give me a moment before you jump down my throat on these two). SD + Baton Pass can be seen in Mega Absol, Mienshao, etc..
Now, if you put all those traits together, you have a very formidable mon that is very tough to get through. It's Base 112 is so crucial against Infernape, Shao, Darmanitan, Hydreigon and countless others. Once it gets a +1, it's going to be outspeeding most of the meta easily. Bug/Poison attacks with psedo-EdgeQuake coverage lets it hit a majority of the tier. The question that will be on the plate is how are we going to judge Scolipede's potential brokenness? Is it a sweeper set with SD? Is is a guaranteed hazard layer? Is it QuickPass booster? The fact that it can run so many sets is very troubling and it can bypass any usual counters with BP. Mega Aggron would be a great stop to the SD set..
+6 252+ Atk Life Orb Scolipede Earthquake vs. 252 HP / 136+ Def Filter Mega Aggron: 316-372 (91.8 - 108.1%) -- 50% chance to OHKO
But, BP to something that resists Steel could be Metagross...
+6 252+ Atk Life Orb Metagross Earthquake vs. 252 HP / 136+ Def Filter Mega Aggron: 388-458 (112.7 - 133.1%) -- guaranteed OHKO
or even to Mega Aggron itself...
Hazards/QuickPass could be taken care of by Sableye/Tornadus/Whimsi with Priority Taunt, but they can maimed if it's an LO attacking set. Almost all of them are outright KO'd by Scoli...
It's really tough to gauge what set Scoli is running. I think Scoli is more easier to use than say Venomoth, but it doesn't have to rely on the 50/50 that Wonderskin was attributed to. It's a tough mon to get through. I like Scolipede a lot, but I don't think UU can really handle this multi-role mon reliably.
But, we'll see how the retest goes....