Blizzard Wolfang gives the Ice Burst to X and Hyoroga to Zero is weak to Blaze Heatnix's weapons.Blaze Heatnix gives the Magma Blade to X and Shoenzan to Zero is weak to Ground Scaravich's weapons.Ground Scaravich gives the Ground Dash to X and Sentsuizan to Zero is weak to Yammar Option.Commander Yammark gives the Yammar Option to X and Zero is weak to Infinity Mijinion's weapons.Some you can find easily, others you have to search for nook and cranny.and quickly, because a nearby Nightmare Virus may attempt to corrupt the Reploids, turning them into a "zombie" version of themselves, making them beyond saving. The enhancement parts are acquired from the rescuable Reploids in the stages, i.e the same Reploids that tried to help with the investigation. Collect them to increase your rank your rank determines the enhancement parts you can equip.
Alongside them are the "Nightmare Virus", DNA-shaped enemies that fly around and can be destroyed for their floating Nightmare Souls bosses will also drop a large amount of these. Defeating a boss can cause additional phenomenon related to said boss to appear in a few other levels. The core gimmick of the game is the "Nightmare Phenomenon", things that appear in the affected places that serve as obstacles in the game. It also turns out that Zero himself is secretly alive and well, and reunites with X to help stop Gate's plans. He finds that they react to him with violence, and he soon discovers that a mad Reploid scientist named Gate is behind the chaos. With the Nightmare under investigation by Isoc and High Max's team of "Nightmare Investigators", X becomes determined to discover how the situation is connected to Zero and begins seeking out said Investigators.