A randomizer ROM is a modified version of the original game that randomizes various elements, such as:

A Pokémon Randomizer is a fan-made tool that modifies a legitimate Pokémon ROM (Read-Only Memory) file. Instead of changing the core game mechanics, it shuffles the game's data pool. A standard randomizer for HeartGold can change:

If you truly have no PC access, try (an Android app, no longer on Play Store, find APK).