MISSINGNO. Talk to the man in Viridian City. Let him catch a weedle. Fly to Cinnibar and surf on the east coast. You will run into Missingno. If you do not catch him, you sixth item will be multiplied to 99+. If you keep on surfing, you will catch a level 174+ Pokemon.

MASTERBALL. Defeat Giovanni in the Silph Co. building.

FREE GAME COINS. Walk around the Game Corner pressing A.

BEAT SABRINA. To beat Sabrina easily, use a pokemon with DIG or EARTHQUAKE. These two tms will wipe out most of her pokemon in one shot.

EXTRA DAMAGE. While fighting, select your desired attack. When it says you are going to use that attack (eg. "Charizared used Fire Blast"), hold down the A button until your opponent's life stops draining. If you timed it right, you'll inflict more damage than usual.

GET SUPER POKE MEWTWO. After you have gotten all eight badges, you beat and meet the Elite. The credits will roll and then the menu pops up again. DO NOT RESET THE GAME!!!! Go to Cerulean City. Go north to Nugget Brige where you faced the 5 trainers. Turn left and there will be a large area of water. Surf until you get to a cave. You will find Mewtwo in that cave.

GET MIMIC. Buy a Pokedoll in Celadon Mart, then FLY to Saffron and talk to the Copycat. She will give you the Mimic TM.

INVISIBLE WALLS IN FUSCIA CITY GYM. If you look at the floors in Koga's Gym, you will see that it has lines. In several places, you will see little gaps in the lines. These lines with the gaps are the invisible walls.

STONE/TRADE EVOLUTION. Some Pokémon will only Evolve when they have been traded. They are:

Before = After
Machoke = Machamp
Graveler = Golem
Haunter = Gengar
Kadabra= Alakazam

Some Pokémon don't Evolve till you give them a Stone. They are: FS = Fire Stone
TS = Thunder Stone
WS = Water Stone
LS = Leaf Stone
MS = Moon Stone
Get most of these stones at the Department Store.

Before = After
Pikachu + TS = Raichu
Nidorina + MS = Nidoqueen
Nidorino + MS = Nidoking
Clefairy + MS = Clefable
Vulpix + FS = Ninetales
Jigglypuff + MS = Wigglytuff
Gloom + LS = Vileplume
Growlithe + FS = Arcanine
Poliwhirl + WS = Poliwarth
Weepinbell + LS = Victreebel
Shellder + WS = Cloyster
Exeggcute + LF = Exegguter
Staryu + WS = Starmie
Eevee + WS = Vapereon
Eevee + TS = Jolteon
Eevee + FS = Flareon

POKEBALL INTO MASTERBALL. Throw a Pokéball or Greatball then hold DOWN + B or UP + B until the Pokéball explodes.