http://www.gamefaqs.com/gamecube/914796-gotcha-force/faqs/52981 Use this link above for more detail including the list of borgs you can create. Some just straight up freeze the game which I personally have a list of which ones work and don't work (US Version).
This method is best for creating new borgs.
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Start the game from a new file or with no memory card inserted and go to Force Edit.
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You will see G Red, a normal ninja, and a revolver gunman. Take G Red off of the first force and put him back in the first cell.
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Now, placing the Normal Ninja on certain forces will determine which borg you get from the glitch. For instance, putting a Normal Ninja in forces 1,9,10, and 11 will get you a D emon Samurai (A list of borg codes will be provided below, use whichever one you like). It does not matter which slot you put them in, so long as they are the only borgs in the forces. After doing that, go to the 20th force.
¤WARNING¤ Everything you do beyond this point can cause permanent damage to your save file. Make sure you try this in a new game before attempting it on your own file. ¤WARNING¤
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Place G Red in the 23 slot and the Gunman in the 15th slot of force 20. This activates the glitch. Once you place G Red, you will be able to pick up an invisible borg from any cell in your box. Be very careful at this point because placing an invisible borg on top of another borg will usually freeze the game. If you aren't sure whether you are holding one, just press B to drop it.
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Pick up an invisible borg from any empty cell in the box and place it on top of the Normal Ninja. You will still be holding an invisible borg, so press B to let go of it. The Normal Ninja should become a new Arrow Ninja, and force 20 will be filled with G Reds. If the game froze instead, than you probably used a non-working code. If the game didn't freeze, you can backtrack at this point by placing another invisible borg on the Arrow Ninja.
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You should see a Normal Ninja in the 24th slot. Some codes will produce something other than a Normal Ninja, and those will work just as well. If G Red is in the 24th slot, than something went wrong. Pick up the borg in slot 24 and place it on the G Red in slot 15. Press B to release G Red.
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Pick up another invisible borg and place it on the Arrow Ninja in your box. The Arrow Ninja will become a new borg depending on which code you used with the Normal Ninjas. Press B once more, as you will be holding an invisible again. Try checking the stats of the new borg. If the game doesn't freeze, than the borg works and can be used in battle, traded, or sent to the warehouse.
