To farm Zoid Core UX in Zoids Legacy, you need to focus on two specific Zoids: Liger Zero and Berserk Fury. These are the only two Zoids in the game that use the Z Core UX. Here’s a step-by-step process to help you locate and obtain these Zoids:

1. Locate Liger Zero and Berserk Fury:
– Liger Zero is one of the main Zoids in the game, and you will likely encounter it early on in your journey.
– Berserk Fury is another key Zoid, but it might be harder to find initially. You can find it by progressing through the game and completing specific missions or quests.

2. Obtain Z Core UX:
– Once you have access to Liger Zero and Berserk Fury, you can equip them with the Z Core UX.
– The Z Core UX is not a drop item; it is an upgrade that you can apply to these specific Zoids.

3. Additional Tips:
– If you’re having trouble finding Berserk Fury, you can look for detailed maps and locations of all Zoids, including rare ones like Berserk Fury.
– The game’s Sandstorm Arena is mentioned as a location where you might encounter certain Zoids, but it is not specifically linked to finding Berserk Fury or Liger Zero.

By focusing on these steps, you should be able to locate and equip Liger Zero and Berserk Fury with the Z Core UX, which will help you in your farming efforts.