With this hack, battles, whether they are in the overworld, or in dungeons, will only start if B is held.
Database match: Lufia II - Rise of the Sinistrals (USA)
Database: No-Intro: Super Nintendo Entertainment System (v. 20210222-050638)
File/ROM SHA-1: A89931C1F29B161B8BE717DFAB4A4ADB54B42B84
File/ROM CRC32: 20F2AC29