Guardian Boots

In Starlight, after you get the lightning bombs, return to the start. Enter the next area. Push on the middle left, where a golden statue used to be. You should enter a room. Lightning bomb the platform to get the Guardian Boots. You can now permanently kick bombs.

Guardian Gloves

In Planet Horizon, after the area where you defeat Ashtarth, go down the stairs. Get the bomb throw, and go to the door in the "Up" area (not the one you came from). Get the Remote Control (bomb the statue and collect it) and step on the two buttons. Go back. Enter the door on the right. Move right, then put the statues on the buttons as was done during the first time in Planet Horizon. Wind bomb to the elevator platform. Throw a bomb downwards and press Z at the top of its arc. It should take away a small pillar object. Return to the beginning of the room. Go up the stairs. Wind bomb yourself across. In the next room, lightning bomb the platform and grab the part to get the Guardian Gloves.

Guardian Vest

In Aquanet, just at the beginning on your right are three pillars. Use an earth bomb here. Enter the hidden doorway on the left. Lightning bomb the platform to get the Guardian Vest.

Guardian Helmet

In Neverland, go to the point with the lava strip in the middle and two knights on the sides. Use a dark bomb at the end of the strip, which resembles a small door, and it will open. Use an ice bomb to freeze the lava in front of it, then walk through. Lightning bomb the platform to get the Guardian Helmet.

Note: You must have a 3.0 or higher version of the Game Shark to use these codes.