Belly Drum Error
Belly Drum is a move who normally suffices to maximize the user's Attack to quadruple its normal value while simultaneously removing 50% of their current HP. Thus, the move is supposed to not function if at under 50% HP. However, you can still use Belly Drum: if you do so, the game will claim that it failed, but it actually did raise your Attack 2 stages (like x1.00 Attack to x2.00 Attack). This is because the command for Belly Drum is akin to 6 Swords Dances: however, one of the six routines is erroneously used prior to the HP deduction.
Drain Move Substitute Glitch
In the Japanese releases of Pokemon Red, Blue, Green, and Yellow, as well as all versions of Pokemon Gold, Silver, and Crystal, there is a glitch involving Substitute - no matter the accuracy of the move, if it is a move that absorbs HP (e.g. Absorb, Giga Drain, Mega Drain), the move will have a 100% chance to miss!
Easy Shiny Ditto/Mew
Note that this glitch involves the use of trading between Pokemon Red/Blue/Green/Yellow (R/B/G/Y) and Pokemon Gold/Silver/Crystal (G/S/C). It will easily result in a Ditto or Mew whose is Shiny, and thus automatically having above-average stats (as is the norm in Pokemon G/S/C). First, you must trade any Shiny Pokemon - a Pokemon whose color is different than normal - from Pokemon G/S/C to Pokemon R/B/G/Y. Any Shiny Pokemon will work, including the Shiny Gyarados you automatically find during gameplay. While on the latter, you need to find a Ditto in the wild: Mew will also work if you use other glitches in those games. While that battle occurs, have the Pokemon that was Shiny be in-battle until Ditto or Mew Transform into that Pokemon. Catch the Ditto or Mew thereafter. Once you do so, trade that Ditto or Mew to Pokemon G/S/C. In doing so, you'll figure out that the Pokemon was Shiny.
Freeze your Game Clock
This is strange, but also permanent, so only do this if you want your clock to remain set on a certain day. To do this, go to Vermillion City and talk to the Machop that is stomping on the ground. After you talk to him, open your Pack, go to Coin Case, and look at how many coins you have. Your game will either freeze or reset, so you must reset if it freezes. When you do, your game clock will be frozen in that exact time unless you use another code to change the time, which is possible.
Contributed By: Jelly Soup.
By capturing every Pokemon in the Kanto and Johto Pokedexes - aside from Mew and Celebi, which are optional - you will be able to speak with the Game Freak director in Celadon City to obtain a diploma recognizing this achievement.
Get through grassy areas without a single random encounter.
Once you've obtained the HM Cut you can use it to teach some of your pokemon the attack of the same name.
This ability now cannot only be used to cut down certain trees but also to get rid of any grass so you don't have to bother with any random encounters.
When saving and loading or leaving and reentering the area you used cut in, the grass will have returned.
Contributed By: KeeperBvK.
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