Armaldo Should be dropped for setup shuck.
Shuckle@leftovers
Impish/Careful nature, Sturdy
252 HP, 252 Sdef/Def, 4 Def/Sdef
-SR
-Sticky web
-Toxic
-Infestation
This is perfect setup... anything that is slow on ground that you don't want to will do better, and what opponent doesn't love a good shuckle sitting their annoying them?
Also Drop something for Rapid spin on the Donphan. and HP grass on Gastro, drop surf or something, also throw down scald and recover, making it a defensive poke, running lefties instead of AV.Maybe like:
Gastrodon@Leftovers
Calm Nature, Storm Drain
252 HP, 252 Def, 4 SpA
-Scald
-Recover
-HP [Grass]
-Earth power
Alright, EP and Scald for STAB, Status, Drops, and Coverage... HP grass to mess up water types, and other grounds, just as well as Ice beam would have, and recover because you need to maintain that thing.
Aerodactyl is perfect, but nickname it Aeropostale (joke, not mandatory, don't worry.)
But if you were to make it Mono-Ground, I would Recommend these: Mamoswine, Golurk, Excadrill, Hippowdon, Gastro, and Garchomp as mega. I would go more in-depth if asked.