This specific ROM is known to trigger AP measures on older flashcarts or emulators, causing the game to "freeze" or "black screen" after battles or when entering menus.
In a clean, scene-released ROM, the name would be something like: 4780 - Pokemon Heartgold (US).nds or 4780 - Pokemon HeartGold Version (U).nds 4780 - Pokemon Heartgold -u--xenophobia-.nds
: Modern emulation on mobile devices has replaced the need for old-school flashcarts. This specific ROM is known to trigger AP