Regular Codes

100+ of Almost Any Item
To get 100+ of almost any item, first put the item you want to
multiply in the sixth item slot. Now use FLY and go to Viridian City.
Talk to the Old Man almost all the way north of the town. When he
asks if you are in a hurry, say no and watch him catch a Weedle.
Right after that, FLY to Fuchsia City. Make you're way south and,
when you reach the water's edge, use SURF and make your way to
Seafoam Island. When you get to Seafoam Island, swim up and down the
beach until you run into a Pokmon called "M" (looks exactly like
Missingno. but backwards). Once you see him, kill him or run away.
After that, you should have 100+ of your sixth item!

Safari Zone Pokmon at Seafoam Island
Go to the Safari Zone. Fight a Pokmon that you want. If you can't
catch it then use up all your time. After you left the Safari Zone,
FLY to Cinnabar Island or Seafoam Island. Then SURF on the water's
edge. Keep surfing down and up until you battle. Battle until you
get the Pokmon you wanted. This makes catching Safari Zone Pokmon easier.

Missingno.
To get Missingno. go to Cinnabar Island and go into the Pokemon
Research Laboratory and trade with anyone in the first room. Then
leave the Lab and go to the EAST of Cinnabar Island and surf up and
down on the part where the land meets the water. Eventually the
battle screen will come up and the screen goes black for about
5 seconds. Once you find him I suggest you use a Level 30 to 40
Pokemon. This is because Missingno., even at Level 80, has a VERY
low defense rating. So get him down pretty low. Even at low he is
still extremely difficult to catch. So next get a Pokmon that knows
a sleep move and put him to sleep. Follow this up with a couple
Ultra Balls and you should have him.

Level 100+ Pokmon
Follow these instructions to catch Pokmon with really high levels.
1. Talk to the Old Man in Viridian City who shows you how to catch
Pokemon.
2. Fly directly to Cinnabar Island.
3. Put your strongest Pokemon on the top of your team.
4. Surf on the shore where the land touches water.
5. Keep Surfing until you run into one of these strong Pokemon.

INFINATE HEALTH
1.have any pokmon with a level over 100
2.evolve it to around level 150 (215-220 for the rydon above) with
rare candies (100+ items code)
3.try to get a wild pokmon to poison your 100+ pokmon (i use an area
behind a bush/tree after the water area south of lavender just before
fuchsia)
4.if that worked, keep playing the pokflute on your turn until you
have about 25 hp left
5.kill enemy pokmon (if you can't then use run because you'll waste
your rare candies)
6.when done correctly, your power should have to go below zero when
your level goes down and it will mess up game so you will have a huge,
almost distracting hp bar that screen wraps several times
7.never atempt to heal this pokmon with pokcenter or any healing
potion etc. or it will glitch and then bring your health back to what
it should be also don't worry when your health goes down to the end
of the bar because it will always refill itself to maximum although
it may not always look like it
8.use 100+ item code for max elixers and full heals so you get rid of
status problems when you want and can keep its pp from running out
9.battle friends and make them frustrated and jealous (no glitching
should occur with this code except with the size and left hand
number of your hp bar)

EASY KHANGASKHAN
1.use old man thing and fly to cinnibar
2.make sure you only have 5 pokemon in your team ('M will glitch game
if you try to take it out of computer no matter what you do)
3.catch 'M while surfing on coastline (its easiest to use a
masterball because it'll die with any hp hurting move [use 100+
trick for more masterballs])
4.use rare candies (100+ trick) on 'M (who should be in your group)
and he'll evolve into Kangaskhan.

Messed up Pokemon League site on the PC!
After you battle a Missingno. check your Pokemon League site on the
PC and it will be messed up, meaning that it will have Pokemon other
than the ones you fought with. Warning: Don't catch the Missingno.

A glitch
Surf on the right coast at Cinnabar Island. Fight a Pokemon that has
Poisonpowder, Poison Gas, etc. When it flickers, estimate the amount
of time in between flickers. Right when it flickers, immediately get
off. You will walk on water for 1 to 3 seconds.

Get 99 of Any Item
All you have to do is go to the man who shows you how to catch a
Weedle in the beginning of the game. He's above Viridian City. Talk
to him and when he says "are you in a hurry?" Say no and he will show
you how to catch a Weedle. Change your sixth item in your item list
to the item you want 99 of. So it would be item 1, item 2, item 3,
item 4, item 5, item to be duplicated, and so on. Then fly over to
Cinnabar Island. Go to the east side of it and surf half on water and
half on land, up and down until you find a Missingno. Don't catch it,
it will damage your saved game. After you defeat it or run away from
it there will be 99 of the items in the sixth item in the item list.