Step 1: Go to genesis part 2.

Step 2: In the eden zone, find a way into the underwater area that isn't the tek trench.

Step 3: Use your suit to fly around the ocean and find a decent mosa.

Step 4: Lead the mosa out through the place you came. If necessary, hover above the ocean in an air pocket and shoot at sharks, tusos, etc

Step 5: Lead mosa out of the ocean fully, and hover above the water to shoot it with darts.

Step 6: Load that bad boy or girl with mutton.

Step 7: Enjoy your easy mosa.