Lumbri, Megadri + Bladit, Coquilskar

Lumbri: They bury themselves in the ground to find compost, turning it into fertile soil. Their body is very slimy but they can learn double team at an early level.
 
Megadri: Their powerful heart gives them great strength for digging. It is said they can cross the Earth in less than an hour.
 
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Bladit: They bury themselves in the sand, leaving their burrow only during high tides. They hop towards their prey and cut off chunks to feed on.
 
Coquilskar: Well armed, they now spend their entire life on the Earth's surface, looking for prey. Some Pokeballs actually break if thrown to this Pokemon.