All of the following are gameshark codes for pokémon yellow:
Buy any item in pokemart 01XX7BCF (note: put the same item #'s for red and blue in the XX's)
Catch any pokemon 01??D7CF (note: put the 2-digit # that you use for the red and blue versions)
Infinite money 019946D3, 019947D3, 019948D3
Infinite HP (In Battle) 01FF15D0 Infinite PP (1st Position) 01282CD0
Infinite PP (2nd Position) 01282DD0
Infinite PP (3rd Position) 01282ED0
Infinite PP (4th Position) 01282FD0
Skill Modifier (1st Position) 01??1BD0
Skill Modifier (2nd Position) 01??1CD0
Skill Modifier (3rd Position) 01??1DD0
Skill Modifier (4th Position) 01??1ED0
Enemy LV Modifier 01??21D0
Change Monster Pic 01??D8CF LV
Modifier Of Creatures Before You Battle 01??26D1
Capture Pokèmon Modifier 01??D7CF
Enemy Can't Attack & Burned At Beginning of Match 0170E8CF
Total Item Number Modifier [Note 1] 01??1CD3
Item Modifier 1st Position 01??1DD3
Infinite Quantity 1st Position 01631ED3
Item Modifier 2nd Position 01??1FD3
Infinite Quantity 2nd Position 016320D3
Item Modifier 3rd Position 01??21D3
Infinite Quantity 3rd Position 016322D3
Item Modifier 4th Position 01??23D3
Infinite Quantity 4th Position 016324D3
Item Modifier 5th Position 01??25D3
Infinite Quantity 5th Position 016326D3
Item Modifier 6th Position 01??27D3
Infinite Quantity 6th Position 016328D3
Item Modifier 7th Position 01??29D3
Infinite Quantity 7th Position 01632AD3
Item Modifier 8th Position 01??2BD3
Infinite Quantity 8th Position 01632CD3
Item Modifier 9th Position 01??2DD3
Infinite Quantity 9th Position 01632ED3
Item Modifier 10th Position 01??2FD3
Infinite Quantity 10th Position 016330D3
Have All Badges 01FF55D3
Have all seen All Pokèmon On PokèDex: 01FF09D3, 01FF0AD3, 01FF0BD3, 01FF0CD3, 01FF0DD3, 01FF0ED3, 01FF0FD3, 01FF10D3 01FF11D3, 01FF12D3, 01FF13D3, 01FF14D3, 01FF15D3, 01FF16D3, 01FF17D3, 01FF18D3, 01FF19D3, 01FF1AD3, 01FF1BD3, 01FFF6D2, 01FFF7D2, 01FFF8D2, 01FFF9D2, 01FFFAD2, 01FFFBD2, 01FFFCD2, 01FFFDD2, 01FFFED2, 01FFFFD2, 01FF00D3, 01FF01D3, 01FF02D3, 01FF03D3, 01FF04D3, 01FF05D3, 01FF06D3, 01FF07D3, 01FF08D3, 01FF09D3,
Protect Status 010017D0
Never Miss & Have More Criticals 01FFD5CF
Buy Item At Store Modifier (Slot 1) 01??7BCF
Buy Item At Store Modifier (Slot 2) 01??7DCF
No Random Battles 01033BD1
Infinite Casino Coins 0199A3D5, 0199A4D5
Start With A Pokèmon Modifier 01??1ED1
Infinite Time (Safari Zone) 01F00DD7
Infinite Safari Balls 016446DA