This is the heart of the challenge. Imagine facing Roark, the first gym leader, but instead of a Geodude and Cranidos, he throws out a Lugia and a Mewtwo. Randomizers often include "similar strength" or "completely random" options. Note: Many players enable "Randomized but not impossible" to avoid an unbeatable level 50 legendary at the first gym.
You can’t play a .nds file on original hardware without a flashcart (like an R4 card), so emulation is the way to go. pokemon diamond randomizer rom
Randomize only abilities, keep everything else the same. Now imagine a Slaking without Truant, or a Shedinja without Wonder Guard. It completely breaks the game’s balance, forcing you to re-learn every strength and weakness. This is the heart of the challenge