Super Robot Taisen Bx English Patch Direct
SRW BX had Japanese DLC (extra money, XP, and secret parts). The English Patch v1.2 does not translate the DLC mission titles. However, the DLC itself is just gameplay; no story is required. You can safely install the DLC .cia file after patching the base game—the DLC items will appear in your inventory in English, but the mission briefings will remain in Japanese.
If you are on the fence about patching this game, here is why BX is worth the effort: super robot taisen bx english patch
If you have the original ROM and the patch file separately, follow these steps: SRW BX had Japanese DLC (extra money, XP, and secret parts)