Pokémon Rejuvenation - Possessed Ryland (Electric/Ground Dual Type)

Difficulty: 3/10
Seeds are OP as usual. A win is a win, though. The strategy is pretty obvious from the video: Use Yawn to set up with Sandslash, and then use hard-hitting Digs, X-Scissors, and Rock Slides to handle Ryland's team.
Chapter 14 Electric types:
Rotom (Lost Castle, after completing Narcissa's quest)
Chapter 14 Ground types:
Gible (Field encounter, Zone Zero)
Zygarde-10% (Reward for obtaining 100 Zygarde Cells and 1 Zygarde Core)
Rules:
I can only use Electric- or Ground-type Pokémon in battle. I can have non-Electric- or Ground-type Pokémon on my team, but they can't contribute to the battle in any way.
I'm also not allowing myself to use Pokémon that eventually evolve into Electric- or Ground-types, but aren't Electric- or Ground-types themselves (For example, Mudkip would be disallowed, but Marshtomp wouldn't be)
I can't use two of the same Pokémon.
I can't use items in battle.
The whole run is being done on Normal mode. I'm not insane enough to put myself through Intense mode, sorry.