Progress until you have access to the Snowpoint Temple equivalent: in HeartGold, Regigigas is in the Sinnoh game; however, HeartGold (Johto) does not normally have Regigigas available in normal gameplay. Regigigas is obtainable only via event trades or by transferring from Diamond/Pearl/Platinum (Sinnoh) after capturing it there. So:
If you use a different version of the HeartGold ROM (such as the European or Japanese releases), the patch will likely fail, resulting in a "white screen" error on emulators like DeSmuME or MelonDS . What is the "Xenophobia" Exclusive? 4780 heartgold xenophobia exclusive
Let’s parse the phrase: