Game Genie Red/Blue
Warning, there is a possibility that these codes can possibly damge or destroy your game save files. Please use these codes at your own risk.

Fight Any Pokemon:
Enter the code, go to the grassy area west of Cerulean City. All Pokemon will be at Level 10.
Note One: This is the only area the code works!
Note Two: You might not fight the Pokemon right away, but it will eventuality show up!
Note Three: It's recommended that master ball's are used to catch all Pokemon
Note Four: If mew transforms before it is caught, it will be a ditto!

Blue Version
XX1-91A-7FC +
XX1-93A-F7E +
XX1-9BA-6EB
Red Version
XX1-91A-7FC +
XX1-93A-F7E +
XX1-9BA-5DB

Pokemon Codes:
Replace "XX" with one of the below:

99 = Bulbasaur 09 = Ivysaur 9A = Venusaur
B0 = Charmander B2 = Charmeleon B4 = Charizard
B1 = Squirtle B3 = Wartortle 1C = Blastoise
7B = Caterpie 7C = Metapod 7D = Butterfree
70 = Weedle 71 = Kakuna 72 = Beedrill
24 = Pidgey 96 = Pidgeotto 97 = Pidgeot
A5 = Rattata A6 = Raticate 05 = Spearow
23 = Fearow 6C = Ekans 2D = Arbok
54 = Pikachu 55 = Raichu 60 = Sandshrew
61 = Sandslash 0F = Nidoran (F)A8 = Nidorina
10 = Nidoqueen 03 = Nidoran (M)A7 = Nidorino
07 = Nidoking 04 = Clefairy 8E = Clefable
52 = Vulpix 53 = Ninetales 64 = Jigglypuff
65 = Wigglytuff 6B = Zubat 82 = Golbat
B9 = Oddish BA = Gloom BB = Vileplume
6D = Paras 2E = Parasect 41 = Venonat
77 = Venomoth 3B = Diglett 76 = Dugtrio
4D = Meowth 90 = Persian 2F = Psyduck
80 = Golduck 39 = Mankey 75 = Primeape
21 = Growlithe 14 = Arcanine 47 = Poliwag
6E = Poliwhirl 6F = Poliwrath 94 = Abra
26 = Kadabra 95 = Alakazam 6A = Machop
29 = Machoke 7E = Machamp BC = Bellsprout
BD = Weepinbell BE = Victreebell 18 = Tentacool
9B = Tentacruel A9 = Geodude 27 = Graveler
31 = Golem A3 = Ponyta A4 = Rapidash
25 = Slowpoke 08 = Slowbro AD = Magnemite
36 = Magneton 40 = Farfetch'd 46 = Doduo 74 = Dodrio 3A = Seel 78 = Dewgong
0D = Grimer 88 = Muk 17 = Shellder
8B = Cloyster 19 = Gastly 93 = Haunter
0E = Gengar 22 = Onix 30 = Drowzee
81 = Hypno 4E = Krabby 8A = Kingler
06 = Voltorb 8D = Electrode 0C = Exeggcute
0A = Exeggutor 11 = Cubone 91 = Marowak
2B = Hitmonlee 2C = Hitmonchan 0B = Lickitung
37 = Koffing 8F = Weezing 12 = Rhyhorn
01 = Rhydon 28 = Chansey 1E = Tangela
02 = Kangaskhan 5C = Horsea 5D = Seadra
9D = Goldeen 9E = Seaking 1B = Staryu
98 = Starmie 2A = Mr. Mime 1A = Scyther
48 = Jynx 35 = Electabuzz 33 = Magmar
1D = Pinsir 3C = Tauros 85 = Magikarp
16 = Gyrados 13 = Lapras 4C = Ditto
66 = Eevee 69 = Vaporeon 68 = Jolteon
67 = Flareon AA = Porygon 62 = Omanyte
63 = Omastar 5A = Kabuto 5B = Kabutops
AB = Aerodactyl 84 = Snorlax 4A = Articuno
4B = Zapdos 49 = Moltres 58 = Dratini
59 = Dragonair 42 = Dragonite 83 = Mewtwo
15 = Mew
 
Replace the Following XX with codes below:
Viridian City PokeMart
XX4-44D-F7A 1st slot
XX4-45D-C46 2nd slot
XX4-46D-D56 3rd slot
Cerulean City PokeMart
XX4-55D-F7A 1st slot
XX4-56D-B3A 2nd slot
XX4-57D-912 3rd slot
Cinnibar Island Market
XX4-BBD-E62 1st slot
XX4-BCD-E66 2nd slot
XX4-BDD-A22 3rd slot
Pewter City PokeMart
XX4-4BD-F7A 1st slot
XX4-4CD-B3A 2nd slot
XX4-4DD-91E 3rd slot
Vermilion City PokeMart
XX4-63D-F7A 1st slot
XX4-64D-A26 2nd slot
XX4-65D-D5E 3rd slot

Get any TM or HM:
FA = TM 50 F9 = TM 49 F8 = TM 48
F7 = TM 47 F6 = TM 46 F5 = TM 45
F4 = TM 44 F3 = TM 43 F2 = TM 42
F1 = TM 41 F0 = TM 40 EF = TM 39
EE = TM 38 ED = TM 37 EC = TM 36
EB = TM 35 EA = TM 34 E9 = TM 33
E8 = TM 32 E7 = TM 31 E6 = TM 30
E5 = TM 29 E4 = TM 28 E3 = TM 27
E2 = TM 26 E1 = TM 25 E0 = TM 24
DF = TM 23 DE = TM 22 DD = TM 21
DC = TM 20 DB = TM 19 DA = TM 18
D9 = TM 17 D8 = TM 16 D7 = TM 15
D6 = TM 14 D5 = TM 13 D4 = TM 12
D3 = TM 11 D2 = TM 10 D1 = TM 09
D0 = TM 08 CF = TM 07 CE = TM 06
CD = TM 05 CC = TM 04 CB = TM 03
CA = TM 02 C9 = TM 01
C8 = HM 05 C7 = HM 04 C6 = HM 03
C5 = HM 02 C4 = HM 01
Store Codes:
Item Codes:
Replace "XX" with one of the following:
01 = Master Ball - $0
02 = Ultra Ball - $1200
03 = Great Ball - $600
04 = Poke Ball - $200
05 = Town Map - $0
06 = Bicycle - $0
08 = Safari Ball - $1000
09 = Pokedex - $0
0A = Moon Stone - $0
0B = Antidote - $100
0C = Burn Heal - $250
0D = Ice Heal - $250
0E = Awakening - $200
0F = Paralyz Heal - $200
10 = Full Restore - $3000
11 = Max Potion - $2500
12 = Hyper Potion - $1500
13 = Super Potion - $700
14 = Potion - $300
15 = Boulder Badge - $0
16 = Cascade Badge - $0
17 = Thunder Badge - $0
18 = Rainbow Badge - $0
19 = Soul Badge - $0
1A = Marsh Badge - $0
1B = Volcano Badge - $0
1C = Earth Badge - $0
1D = Escape Rope - $550
1E = Repel - $350
1F = Old Amber - $0
20 = Fire Stone - $2100
21 = Thunder Stone - $2100
22 = Water Stone - $2100
23 = HP Up - $9800
24 = Protein - $9800
25 = Iron - $9800
26 = Carbos - $9800
27 = Calcium - $9800
28 = Rare Candy - $4800
29 = Dome Fossil - $0
2A = Helix Fossil - $0
2B = Secret Key - $0
2D = Bike Voucher - $0
2E = X Accuracy - $950
2F = Leaf Stone - $2100
30 = Card Key - $0
31 = Nugget - $10000
32 = PP Up - $9800
33 = Poke Doll - $1000
34 = Full Heal - $600
35 = Revive - $1500
36 = Max Revive - $4000
37 = Guard Spec. - $700
38 = Super Repel - $500
39 = Max Repel - $700
3A = Dire Hit - $650
3B = Coin - $10
3C = Fresh Water - $200
3D = Soda Pop - $300
3E = Lemonade - $350
3F = S.S Ticket - $0
40 = Gold Teeth - $0
41 = X Attack - $500
42 = X Defend - $550
43 = X Speed - $350
44 = X Special - $350
45 = Coin Case - $0
46 = Oak's Parcel - $0
47 = Itemfinder - $0
48 = Silph Scope - $0
49 = Poke Flute - $0
4A = Lift Key - $0
4B = EXP. All - $0
4C = Old Rod - $0
4D = Good Rod - $0
4E = Super Rod - $0
4F = PP Up - $0
50 = Ether - $0
51 = Max Ether - $0
52 = Elixier - $0
53 = Max Elixier - $0
Numbers above 64 will crash the game. Some numbers were not included because they don't have a point(useless codes)

Easy Money: 996-11B-E6A
This code will change the value of Poke Balls to $990200. When you enter the store, turn the Game Geine off and buy some Poke Balls. Then exit, enter and turn the Game Geine back on. Now you sell Poke Balls for $495100!