CheatCodes.com has all the official Mega Man Battle Network 4 - Blue Moon GBA cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Tuesday May 21, 2013 for Mega Man Battle Network 4 - Blue Moon are shown below.
77038416 - Airhocky 3 V 25435428 - Beat(ncblock) 68009092 - Wideshot 3 T 03696858 - VariableSword 3 T 02368995 - untrap 14769745 - untrap 43494372 - Bodypack(ncblock) 05178924 - Busterpack(ncblock) 94872322 - unlocker 00274304 - unlocker 10170506 - Tango(ncblock) 89866302 - Sneakrun 24247309 - Sneakrun 88019791 - Twinfang 3 G 19095677 - Colorpoint 75420107 - Custom 2(ncblock) 46292983 - Flameline 1 G 57604335 - Flameline 3 J 59891137 - Full Energy 84625799 - Full Energy 30873642 - HP+300(ncblock) 97618739 - HP+500(ncblock) 32108251 - Snake R 66703422 - Recover 300 J 73298100 - Rush(ncblock) 27979609 - Lock Enemy 37198940 - Lock Enemy 02109544 - Mega Folder 2(ncblock) 16589650 - Mini Energy 45798331 - Mini Energy *****************EXCLUSIVE CODE******************* 74293099- GunDelSol EX
In megaman battle network 4 you can get proto soul NOTE:you gotta start the game over if you defeated duo. You can his soul in the bluemoon tournament.
To make a life sword you will need to have a sword E, L, or S; a wide sword E, L, or S; and a long sword E,L, or S. You will need to have them all on your chip selection screen. First choose the sword, then the wide sword, and finally the long sword, select OK and your swords will combine into one. The life sword does 400 damage. It has a length of 2 spaces and a width of 3 spaces. Note: if you do not select the chips in the correct order the life sword will not be created.
In order to get to Black Earth, you need to get the five evil chips. Also you need to get the 6 souls and 150 standard chips. Once you have the souls and Standard chips got to undernet 4. There will be a purple skull door that you can open. Behind it the entrance to undernet 5. Go to the back and there will be a ramp. Go up it and open the door. Go over to the statue and hit the A button. You'll have to fight Bass. Once you beat him, you'll get a giga chip(BassAnly). After you beat Bass jack out and go back to undernet 5. Search around and you'll find 3 black navis. After you talk to them you'll fight a ten round battle of viruses. Once you beat them, you will get an evil chip. One will give you Blackwing; another will give you a Muramasa; and the last will give you an Anubus. In undernet 6, you need to find ElemperoEX viruses. You need to S-Rank them. If your lucky, you'll get another evil chip called Elemdark. The last one is a giga chip. In undernet 4, you need to find Shademan(he'll be random).You need to beat him without destroying the green mystery data on the field. Also you could do the same with Laserman in undernet 5. First you need to beat his beta version somewhere.
if you die while you're evil megaman, you change to dark megaman. While you're dark megaman, you have no control over him whatsoever except you can still use the chips you've selected, but dark megaman will use chips too, ones that you didn't even select!
To use darkchips megaman must be worried. To make megaman worry simply take damage from enemy attacks over and over. When you use darkchips megaman will become evil, and various status conditions may occur, such as constant hp loss, confusion, swamp panels wherever you step, or even hp loss while selecting chips! Also, every battle you use a darkchip in your max hp will drop by 1. the good news is the more you use darkchips, megaman will stay evil when a battle starts unless you jack out. (Note: If you want to use darkchips just for fun, but you don't want your max hp to drop,save before you jack in and when you're done going your little rampage, just turn off your gameboy.)
When you need to find woodman on the net for Sal, don't worry about the wood poles, as long as you have undershot installed, you won't die. (note: viruses can still kill you though.)
When you're supposed to give the darkchip to the blacknavi in Park 2, but you don't know how to open the Castillo door, look at the note by the unconscious navi, you see the numbers under the letters, they are the letter's corresponding numbers, so put the letters in order from greatest to least, the new orders of letters is the code.
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