ensure you don't face a Level 5 Groudon in the first patch of grass. Trainer Rosters

A standard ROM is a digital copy of the original game. A Randomizer ROM is a modified version—or a tool applied to a clean ROM—that shuffles key elements of the game. This creates a unique, unpredictable journey every time you start a new file.

from the start of the game. Combining the increased difficulty of Challenge Mode with randomized teams creates the "ultimate" version of the Unova experience. 4. Quality of Life Tweaks