To get the Platboom Echo in The Legend of Zelda: Echoes of Wisdom, follow these detailed steps:

### Step 1: Identify the Locations
The Platboom Echo can be found in two locations:
1. **Stilled Desert Temple Ruins**: This is during the “A Rift in the Gerudo Desert” main quest. When you enter the Stilled Desert Temple Rift, look for caves where you will encounter Platbooms.
2. **Cave Behind Gerudo Town**: This cave is located north of Gerudo Town. Climb up the cliffs using Beds or other platforming Echoes, and then use a red ladder to enter the cave.

### Step 2: Navigate to the Caves
#### For the Stilled Desert Temple Ruins:
1. **Enter the Stilled Desert Temple Rift**: This is part of the “A Rift in the Gerudo Desert” main quest.
2. **Find the Caves**: Inside the rift, look for caves where you will encounter Platbooms.
3. **Defeat the Platboom**: You can use your Swordfighter form to slice it from the side or another combat Echo to defeat it. The Platboom Echo will drop after you defeat your first one.

#### For the Cave Behind Gerudo Town:
1. **Climb Up the Cliffs**: Use Beds or other platforming Echoes to climb up the cliffs north of Gerudo Town.
2. **Find the Red Ladder**: Once at the top, look for a red ladder leading into the ground.
3. **Enter the Cave**: Use the red ladder to enter the cave where you will find Platbooms.

### Step 3: Defeat the Platboom
1. **Lock Onto the Platboom**: Use the ZL button to lock onto the Platboom.
2. **Summon Long-Ranged Echoes**: Use long-ranged echoes like Spear Moblin or Boomerang Boarbin to deal damage. Alternatively, turn into Swordsman mode and defeat the monster when it is on ground level.
3. **Bait the Platboom**: You can bait the Platboom to slam down, then use Tri to hold it still while you or one of your Echoes defeats it.

### Additional Tips
– **Energy Cost**: The Platboom costs 3 energy to summon, but this cost will drop to 2 energy when Tri reaches level 8, allowing you to summon three Platbooms at once.
– **Platforming**: The Platboom can be used as a platform that can also squash enemies, making it incredibly helpful for traversal and reaching high platforms.

By following these steps, you should be able to obtain the Platboom Echo and utilize its unique abilities effectively in your adventure through Hyrule.