All armor parts,all enemy skills,all sub-tanks,all heart tanks,all ride armors and no enhance chip aquire, so you can still have the change to obtain the gold armor in doppler stage.The stage start at where Doppler stage just shown out at the MAP selection screen
First, collect all of the Heart Tanks, Sub-Tanks, Ride Armors, and Armor parts, but DO NOT take one of the enhancement chips offered by the pink capsules. Head to Doppler Stage 1, and make sure you have full energy (use the Ride Armor if you think you won't be able to keep full energy). Somewhere in the stage, there will be some balls with spikes falling into a pit. Jump to the left side of the pit and you will go inside a secret room. Inside this room is a capsule that contains the Gold Armor. Like its name, this armor will turn X's suit a golden color, and it also gives him the abilities of all four enhancement chips.