It is often used as the standard base for patching because developers know the underlying code is clean and reliable.
If you want, I can:
Crucially, no in-game mechanic enforces xenophobia. You never need a "foreign passport." You can trade with Kanto immediately after the first Gym. The only real exclusion is version-exclusive Pokémon (e.g., Gligar in HeartGold , Skarmory in SoulSilver ), but those are design choices, not xenophobic allegories. pokemon heartgold xenophobia 4780 link