Proposing Sandygast to go down a tier. I used it for my in-game run and it's pretty awful.
- arrives at the very end of Akala Island, meaning that it'll be a bit underleveled if you immediately move onto Ula'ula afterwards. You need to backtrack in order to farm any XP on it - Hano Beach and Malie City/Garden areB infested with Water, Grass, and Dark types and it's too weak to take on Hau's Raichu.
- all of its good movepool arrives way too late. Besides the very weak Bulldoze, you have zero STAB until lv41 and you're pretty much close to the E4 once you get Earth Power and Shore Up. For most of the game, you have to make do with Mega/Giga Drain and Psychic.
- late evolution at lv42. Mine didn't evolve until the Aether Foundation turns against you, and it was the last of my party to do so.
- I reset for a Calm one, and in spite of that, most STAB special attacks do a good chunk of its HP in one hit. It is slow with many common weaknesses against rivals, totems, and kahunas especially since you don't get Shore Up until lv54.
The only saving grace for it is being a Hypnosis user with recovery and being somewhat useful with Quick Claw for this reason. In general, it's inferior to most of the other Ground or Ghost types available.
Sandygast is slow and fragile, gets its good moves way too late, evolves late, and has limited resources to pull its weight on a team with all kinds of common weaknesses....it deserves to be in D imo.
I'm baffled as to why Salandit is listed as top tbh. Getting a female is a PITA and it can't take a single hit. Sure, it's a fast sweeper, but you're in for a world of hurt if it misses a OHKO for any reason. I give it Firinium Z and never took it off because getting those KOs is quite essential. B is a lot more fair given its flaws.