These are strait from Gamefaqs message boards and are the best way to go to get stronger and better at the game.I, myself have tested these codes and they work VERY well!!!!. Here They Are!

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This is a "Create Your Own Style" topic done to the extreme, because you actually get to play with that style.
**
ALL Information taken from this topic:
http://boards.gamefaqs.com/gfaqs/genmessage.php?board=924452&topic=21581408
Do NOT credit any of these codes to me.
All of the following will be GameShark SP codes. If you wish for ARv3 codes or any other codes, please make a similar topic for that type of code.
**

Use this code as your master code:

Team Protoman
00009876 000A
100003E4 0007

Team Colonel
0000D2D1 000A
100003E4 0007

And this to open the E-Reader screen:

Team Protoman
42001270 0000
00000037 0002
320012DE 0000
4200612C 4343
00000037 0002
3200619A 0043

Team Colonel
42001270 0000
00000037 0002
320012DE 0000
4200612C 8D8D
00000037 0002
3200619A 008D


Now is the part where the customization begins. You'll be using this code set-up:

320079A000XX

Where XX is the number of cards you used in hexadeciaml numbers. You can have 32 cards max.
**
If you are not familiar with hexadecimal coding, don't worry. It's very simple. Simply count like normal, but add in A-F after 9. For example, "01, 02...08,09,0A,0B...1E, 1F."

1F is 32, the highest number of cards you are allowed.
**

Now to continue, here comes the fun part. You are going to pick what cards and in what order you will put them in, creating different effects for your chosen "style."

The code for this is:
320079YY00XX

For this one, the YY will start out at D0 and go up by one hexadecimal number for every code you enter. The XX is the actual card itself that you are using. Here are the cards you will choose:

01 - Mettaur (HP+40, B+<Guard, [FlotShoe])
02 - VolGear (HP+60, FireBody, Attack+1, BstBlank)
03 - Ghost (Flotshoe, BvInvis, [HP-80])
04 - Swordy (BvLongS, [Attack-1], [Speed-1], [Charge-1])
05 - Fishy (FlotShoe, Airshoe, [MoveBug])
06 - Piranha (HP+100, AquaBody, Speed+5, Fish, [Tango])
07 - Ratty (FstGauge, [HP-20%])
08 - Billy (ElecBody, BvThundr, [UnderSht])
09 - Candela (Firebody, AutoHeal, [B+<])
0A - Anaconda (HP+130, WoodBody, [Rush], [Beat], [Tango])
0B - Mushy (WoodBody, CSconfus, [MoveBug])
0C - Spikey (Firebody, BvHeatS, [Speed-1], [Charge-1])
0D - Puffball (WoodBody, BvShield, [BatHPBug])
0E - Yort (HP+30, BvYoYo, [B+<])
0F - Dominerd (B+<CurS, [HP-50])
10 - Null (HP+150, AquaBody, AutoHeal, [SprArmr], [BvChrgS])
11 - BrushMan (SwmpBust, MoveHoly, [HP-30%])
12 - Scuttlst (Fbarr100, [Custom-1], [CustDmg])
13 - SnowBlow (HP+120, BvVacuum, [SloGauge])
14 - KillrEye (ElecBody, CSstun, [BatHPBug])
15 - Quaker (HP+150, CusHPBug, [ChpRecov])
16 - Boomer (BvBoomer, B+<Shld, [B-Buster], [CusHPBug])
17 - Lark (HP+100, AquaBody, BvWshot, [DmgBlind])
18 - Moloko (Fbarrier, [CSeffect])
19 - Melody (HP+90, Movebug, [SprArmr])
1A - Zomon (HP+60, BvKatana, [BstBlank])
1B - Catack (HP+100, SprArmr, [AirShoe])
1C - Champy (HP+100, FireBody, Speed+1, Charge+1, [CSeffect])
1D - Whirly (HP+80, AquaBody, WtrBust, [MoveWatr])
1E - Cactikil (HP+60, WoodBody, SprArmr, [Flotshoe])
1F - Roll (CSchpdst, Fbarrier, BatHPBug, [HP-5%])
20 - GutsMan (HP+300, UnderSht, [Fbarrier])
21 - FireMan (HP+30%, FireBody, BvFireAm, [AddBustr])
22 - Bass (HP+200, Attack+5, Speed+5, Charge+5, [SoulTm-2])
23 - QuickMan (Speed+5, Charge+5, FstGauge, [HP-10%])
24 - SnakeMan (HP+25%, WoodBody, Millions)
25 - BubblMan (AquaBody, Fbblwrap, SneakRun, [HP-50])

26 - FlameMan (HP+10%, FireBody, ChpRecov)
27 - MetalMan (HP+300, Attackx2, SprArmr, CSbreak, [Custom-2])
28 - ShadeMan (FlotShoe, AirShoe, BvPulsar, [HP-70], [SoulTm-1])
29 - SparkMan (HP+140, ElecBody, CSblind, [NrmGauge])
2A - JunkMan (HP+150, BvPoltr, [BstBlank])
2B - GyroMan (FlotShoe, AirShoe, Beat, [HP-5%])
2C - Meddy (ChpRecov, Tango, DmgBug, [CusHPBug])
2D - CosmoMan (MegFld+1, GigFld+1, [HP-20%])
2E - Chaud's Custom (Custom+1, B-Sword, BvWideS)
2F - Mr. Match's Custom (HP+300, FireBody)
30 - Count Zap's Custom (HP+300, ElecBody)
31 - Anneta's Custom (HP+30%, WoodBody)
32 - Chillski's Custom (HP+30%, AquaBody)
33 - BugTank (HP+80, BvMiniBm, [CustDmg])
34 - Powie (HP+50, CShole, [EmoBug])
35 - Froshell (HP+140, B-Bomb, [Fbarrier])
36 - HardHead (BvCanBal, EmoBug)
37 - Cloudy (AquaBody, CustDmg, CusHPBug, [SprArmr])
38 - Gaia (HP+100, CrakBust, [FlotShoe], [AirShoe])
39 - Popper (WoodBody, ChpRecov, [MoveGras])
3A - Fan (BvTrnado, [HP-50])
3B - Drain (ChpRecov, BatHPBug, [HP-80])
3C - Rush (Rush, [Beat], [Tango])
3D - Bunny (ElecBody, BvZapRng, [SprArmr], [StatGrd])
3E - Flamey (HP+160, FireBody, B-Crack, [MoveHole])
3F - Shrimpy (AquaBody, BvBubSht, [Attack-1])
40 - RedUFO (CSchpdst, [ChpRecov], [MoveBug])
41 - Ninjoy (BvMonBld, SneakRun, [HP-10%])
42 - LavaGon (HP+150, FireBody, AirShoe, [Fbarrier], [MoveHole])
43 - Protecto (GigFld+1, [UnderSht], [BvChrgS], [B+<])
44 - Basher (FireBody, Attack+1, CShole, [Speed-3])
45 - Pengi (HP+150, AquaBody, [MoveIce])
46 - EleBee (ElecBody, CSblind, [BvChrgS], [Fbarrier])
47 - AlphaBug (ChpRecov, [BatHPBug])
48 - N.O (HP+100, AutoHeal, BatHPBug, [StatBug])
49 - EleBall (ElecBody, FlotShoe, Battery, [AddBustr])
4A - Dharma (Undersht, BvAirHoc, [HP-15%])
4B - Weather (GrasBust, CSlava, [MoveIce])
4C - Elmperor (CSswamp, StatBug, [AddBustr])
4D - CirKill (BvCircG, [MoveBug])
4E - Drixol (Speed+3, Charge+3, BvDrlArm, [DmgConfs])
4F - Batty (AirShoe, BvPulsar, [HP-5%])
50 - Appley (WoodBody, StatGuard, [BstBlank], [EmoBug])
51 - WoodMan (HP+25%, WoodBody, StatGrd, [AddBustr], [BvChrgS])
52 - ElecMan (HP+200, ElecBody, AutoHeal, [B+<])
53 - ProtoMan (HP+100, BvWideB, B+<Shld)
54 - BombMan (HP+150, FireBody, BvBlkBom, [Custom-1])
55 - MagicMan ([HP-200], Custom+1, SoulTm+2)
56 - HeatMan (HP+100, FireBody, Atk+2, CSlava, [BvChrgs])
57 - GateMan (HP+150, Custom+2, [NrmGauge])
58 - FlashMan (HP+20%, ElecBody, CSstun, [B+<]
59 - DrillMan (HP+200, AirShoe, BvDrlArm, [MoveHole])
5A - KingMan ([HP-150], Custom+2, MegFld+1)
5B - AquaMan (HP+170, AquaBody, BvSeaSed, [UnderSht])
5C - WindMan (HP+120, AirShoe, [Attack-2], CSbrrdlt)
5D - LaserMan (HP+250, CSreset, [SoulTm-1])
5E - Colonel (HP+280, BvCcann)
5F - TmhkMan (HP+200, WoodBody, Attack+3, SprArmr, [MegaFld-1])
60 - Lan's Custom (NormBody, MegFld+2, [B-Buster], [BvChrgS])
61 - Dex's Custom (HP+150, Attack+5)
62 - Maddy's Custom ([EmoBug], [StatBug])
63 - Yahoot's Bug Repair (MoveBug, PanelBug)
64 - Tora's Tactics (Rush, Beat, Tango)
65 - LiveVirus (HP+10%, FlifeAur, [CustDmg])
66 - Gospel (HP+600, [EmoBug], [BatHPBug], [CusHPBug], [StatBug])
67 - Serenade (BvRflect, ChpRecov, [HP-20%])
68 - Alpha (HP+100, GigFld+2, [Custom-3])
69 - BassGS (HP+300, CSHPBug, [StatBug])
6A - Duo (HP+40%, MegFld+1, GigFld+1)
6B - BassXX (HP+400, FlotShoe, AirShoe, Fbarr200, [BatHPBug])
6C - NebulaGray (BvDarkS, [HP-30%], [BatHPBug], [CusHPBug])
6D - Dad's Repair Program (BugStop)
6E - Hub Hikari (Attackx2, Custom+3, MegFld+2, GigFld+1, [HP-50%])
6F - Bass-Cross Megaman (HP+200, NormBody, SprArmr, TriBustr, BvSBustr, [MegFld-2])


                                              KEY:
[NAME] = A bad effect. If the item inside is good, it means this is removing that effect from all cards above it. It may also be a glitch, which can be stopped by Dad's Repair Program.
CS____ = Charge Shot effects. These may change the panel under the enemy, cause status effects, or do any number of things.
___Bstr = A Buster effect. If you hit an enemy with your normal buster, the panel under them changes to this.
B< = Your shield skill. If you press B and Left at the same time, this happens.
B- = Changes your normal B-button attack to this. If this is a chip, you cannot add attack damage or speed to it, and AddBsrt effects will not work with it.
Bv = Charge shot effect. If it changes your charge shot to a chip, you cannot add attack damage or speed to it, and CSeffects will not work with it.
Everything else is pretty self-explanitory.

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Ok, now this is what were gonna do. I am going to post my style and you can all post your style ideas in the comment box with your questions.I will tell you whta you should add and what you should take out. ANY questions? Good. Now here Is My style

                                PROTEGABASS STYLE

320079A0000F (code Set UP)
320079D00004(swordy)
320079D10022(bass)
320079D20053(protoman)
320079D30060(lans custom)
320079D40069(bass gs)
320079D5006B(bass xx)
320079D6006F( BASS-CROSS-MEGA
320079D7006E(hub hikari)
320079D80065(life virus)
320079D90023(quickman)
320079DA0067(serenade)
320079DB0068(alpha)
320079DC006A(duo)
320079DD006C(nebula grey)
320079DE006D(dad's repair program)
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PROTEGA BASS POWER-UPS

Start Battle with LIFE AURORA(200hp BARRIER)
Charge Shot Becomes Dark Swoerd(No Hp Loss)
Buster Shot Becomes Spreader(Zooms down and hits most enemies)

ABILITYS
Air Shoes
Float Shoes
Spr Armor
Bug Stop

BAD STUFF

Lose  A Little Less Then Half Your Max HP
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I personally am a big fan of these style change codes because they are something crapcom had taken away from us and we fought to get back! Now enjoy the return of style change from Mega Man Battle Network 2 and 3

                                                                                The Game Master