When a Hatchimal is assigned to a house the house will start generating coins and you'll see your Hatchimal walking around Hatchtopia.
Assigning a Hatchimal to a house:
- Place a house in your world and wait for it to complete construction.
- Tap on the house.
- Tap on the pink 'Assign' button.
- The Collection panel will appear at the bottom of the screen.
- Drag the chosen Hatchimal to the chosen house.
If you want to change the assigned Hatchimal, drag a new Hatchimal in its place.