YAY! I found some more!
R/B ones first.
No.1
You must start a new save file and proceed into the game until you reach professor Oak.
The professor will give you your first pokemon to train, and it will have a name other than mew (bulbasaur, charmander, squirtle).
Once you receive the pokemon, it will ask you to nickname the character. Name the pokemon mew and it will be listed as the 151st pokemon in the pokedex as "mew 151st."
The pokemon will show up and fight as mew from this point on.
No.2
To get dragopikasaur.
It is a mixture between dragonite, Pikachu, and Vensaur.
Go talk to bill and then go talk to proffesro oak and then got to the guard at the s.s anne. He'll say: "The ship has set sail. Then got to the pokemon league and win. Then got in the cave. go all the way through and then fly to the Fushia city. surf to the seafoam islands and surf in there where the square is part land and part sea. After a while, you will run into dragopikasaur, which is at level 100!!!
It beats any thing. It knows Thunder, Hydro pump, hyper bem, and fire blast. The catch is it has infinite pp of each move. It is also a one-hit KO.
Hope i was a big help!!
P.s. you had to have already beat the elite-4 to get him.bummer!!!
No. 3
How to get to Jhoto..... WELL! HERE IT GOES!
First You go to the s.s. anne. get the hm cut. but dont get off! go battle someone, or something... lol.... well anyway.
Purposely lose. you will be at the pokemon center and will have the hm cut. well anyway. go on with your adventure around the pokemon world. eventually beat the pokemon league. then go to vermilion city, and go to the s.s. anne.
Surf behind the ship, and there will be a truck. go to the fron of it, and use strength to move it out of the way. after that you will see a hole.
BUT DONT GO IN IT! go back to the pokemon center in vermilion city and deposit all of your items.
Then go back behind the s.s. anne where that truck was. then jump in the hole! hope you have a fun time in jhoto!
ps. i know its really long but its worth it! it's really fun! you can get 16 badges. bye bye paaaaaaaayce out!
No. 4
Lv. 50 Togepi
1.Defeat the Pokemon League 9 times in a row without 1 pokemon fainting
2.Talk to Prof. Oak and he'll tel you to go to the power plant
3. Go to where Zapdos was and Brock will be there. Talk to him and he'll tell you about a mysterious pokemon
4. He wil then battle you and if you win you get a Lv. 50 Togepi
No. 5
When you reach the Indigo Plateau go and catch one Magikarp lv.5 and release all your other pokemon. When you enter the Elite Four You will be taken straight to Gary.
Prof Oak and all the Elite Four will be there. Prof Oak will say "you poor child, what happened to your other pokemon?"
He will then fill your pc with every single pokemon on lv.100 each of them with the best moves they can know.
If you then take out one mewtwo, one gyarados, one charizard, one venusaur, one blastoise and one zapdos and go see professor oak he will challenge you using a pokemon on lv.1 which is made of scrambled symbols.
When you win he will say 'wow!' and then give you the pokemon you battled against on lv.40 with thunder, hyper beam, psychic and earthquake.
There! It would take too long to post all of them even with copy/pasting. Here's 2 really cr**py G/S ones submitted by the same person. :D :D :D
Celibi
Many say that it is impossible to get celibi but i figured out this good cheat. First you must get a male Abra and a Ditto. Get them both at level 30+ and let them both hold an everstone. Then take them to the breading ground. They will have an egg and it should be a Celibi if the code is done right. If you take them to the day-care centre to get them to 30+ the code will not work, they should have had and egg by them, but if they haven?t then try this code but it may not work.
Shining Onix
Go to Union Cave on the weekends. You might have heard before from some guy the following (He is in Union Cave) he stated "On weekends, I can hear strange *ROARS* from deep inside the cave." On weekends, go to the deepest levels of Union Cave (Lowest Basement/Level) and at some point a Shining Onix will appear. Make sure to take low level Pokemon to battle and weaken it, and some Ultra Balls, or simply use a Master Ball.
They're all from supercheats.com a site that apparently tests every cheat that's submited.
~HORN!