Managing your "deck" of Zoids is crucial. You must balance heavy hitters with support units. The Pulse System: Use specific commands to influence the flow of battle. Challenge Mode:

The game was designed to serve as a kind of ultimate Zoids experience, combining the stories of the previous three GBA games while cutting some sections and expanding others. It also features improvements in graphics and sound, plus characters, Zoids, and story elements from the Zoids Genesis anime.

The official English translation patch can be downloaded from the following legitimate sources:

This title is considered the "best" in the Saga series by many fans because it brings together characters and Zoids from: Chaotic Century New Century Zero Fuzors Genesis

The scope of the translation is comprehensive. Nearly all primary in-game text has been translated into English, as detailed by the patch notes:

You should own the physical Japanese cartridge, as distributing ROMs is illegal.

(e.g., DraStic for Android, MelonDS or DeSmuME for PC). Steps:

Widely considered the best DS emulator for Android. Drastic is paid (around $5) but offers unmatched performance, save states, controller support, and customization options. It runs Zoids Saga DS flawlessly.

to your device.