Enable the Debug Menu in-game by pressing L+R

debug_enabler.ccs

import asm65816

// Script that enables debug mode if you hold L+R while the game boots

// OPTION 10 (Teleport) -- LEARN TELEPORT ALPHA
// OPTION 11 (Star α) -- LEARN STARSTORM ALPHA
// OPTION 12 (Star β) -- LEARN STARSTORM BETA
// OPTION 13 (Player 0), input player's name (english)
// OPTION 14 (Player 1), input player's name (kana?)
// OPTION 20 (Meter), set magicant hp/pp rolling flag (can't be undone lol, softlocks battles waiting for HP/PP to finish rolling)

ROM[0xC0B9B0] = {
    STZ_a (0x436C) // Turn off the debug flag
    JSL   (DebugCheck)
}

DebugCheck:
    LDA_a (0x0065) // Held buttons on controller 1
    BIT_i (0x0020) // JOY_L | JOY_R
    BEQ   (7)      // Branch to "RTL"
      // If we reached this, it means we were holding L+R while the game was booting
      DEC_a (0x436C)   // Enable debug flag
      JSL   (0xEFE689) // Jump to boot-up debug menu
    RTL

// Fix broken debug options
ROMTBL[0xC3E874, 10, 9]  = "Teleport[00]"  // From MOTHER2 katakana "テレポ"
ROMTBL[0xC3E874, 10, 10] = "Star [8B][00]" // From MOTHER2 katakana "スターα"
ROMTBL[0xC3E874, 10, 11] = "Star [8C][00]" // From MOTHER2 katakana "スターβ"
ROMTBL[0xC3E874, 10, 12] = "Player 0[00]"  // From MOTHER2 katakana "プレーヤー０"
ROMTBL[0xC3E874, 10, 13] = "Player 1[00]"  // From MOTHER2 katakana "プレーヤー１"
ROMTBL[0xC3E874, 10, 19] = "Meter[00]"     // From MOTHER2 katakana "メーター

// Change "tx6" text to "Next"
ROM[0xC454BF] = {
    ASMLoadAddress0E(TXT_NEXT)
}

TXT_NEXT:
    "Next[00]"