Since I cant art for the life of me there is no sprite but, I would like to put out an idea for a delta line:
Delta Roggenrola: Water/Ground Type. The Seabed Pokemon Abilities: Water Absorb, Water Compaction, Solid Rock(H/A). PokeDex: Lurking in oceans, this Pokemon slipped and fell into an ocean, the core got extinguished and the body was weather down to nothing, but with the core intact, and with the ocean pressure, this roggenrola had its new body made out of sand and coral.
Delta Boldore: Water/Ground Type. The Ocean Floor Pokemon Abilities: Water Bubble, Water Absorb, Solid Rock(H/A). PokeDex: After living in the deep depths of the sea, the pressure has compacted boldore. Hunting corsola for there coral spines.
Delta Gigalith: Ice/Ground Type.The Blue Ice Pokemon Abilities: Refrigerate, Heatproof, Pressure(H/A). PokeDex: Lumbering on the bottom of the sea, this Pokemon walk along the sea floor. The freezing temperatures have created blue ice on the body of the Gigalith, they use these ice crystals to defend there territory.