Cinnabar Island Glitch:
Talk to the old man who teaches you how to catch Pokemon and say "No" the first time and "Yes" the second time. Then fly to Cinnabar Island and surf along the East coast of it. You will then find some high level Pokemon and MissingNo.
Bulbasaur (Yellow Only):
In Cerulean City, there will be a house with a girl in it who will give you a Bulbasaur.
Charmander (Yellow Only):
Go North in Cerulean City and past the bridge. At the very top, by the mountain, there will be a boy who will give you a Charmander.
Squirtle (Yellow Only):
There will be an officer in Vermilion City who gives you a Squirtle.
HMs:
HM1 Cute - Vermilion City [S.S. Anne (Captain)]
HM2 Fly - Celadon City [Cycling Road (Secret House)]
HM3 Surf - Fuchsia City [Safari Zone (Secret House)]
HM4 Strength - Fuchsia City [Safari Zone Owner's House]
HM5 Flash - Route 2 [Oak's Helper]
Avoid Poison Damage:
If your Pokemon is poisoned, and you don't want it to get hurt when you try to get to a Pokemon Center, every three steps, save and turn off the power. This way, you will not loose any health since every four steps you loose one hit point.
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