jelome1989 | Pokemon Yellow: How to Teach Pikachu Surf Without GameShark + Beach Minigame 7511 High Score @jelome1989 | Uploaded April 2016 | Updated October 2024, 3 hours ago.
This also works on the 3DS VC (forward to 02:48). I don't see any good reason to do this if you have the 3DS VC, because you can play the Pikachu Beach Mini Game even if your Pikachu does not know Surf. The only benefit I see for this is that you can use the Pikachu sprite while surfing, as demonstrated in the video.

For this to work, you have to get the WS M key item. Getting WS M takes a whole tutorial in itself. Watch this video on how to get WS M: youtu.be/jR5rov2e6PU

After you get WS M, have these CURRENT or ACTIVE Box Party and Item Setup:

Item Setup:
Item 1: Any Item
Item 2: WS M
Item 3: Lemonade x57
Item 4: X Accuracy x117
Item 5: Carbos x209
Item 6: Poké Ball x119
Item 7: Fresh Water x201

This item setup will replace the fourth move of the Pokemon on the first slot of your party with Surf. So make sure Pikachu is at the top of your party.

MAKE SURE YOU DO THIS SETUP CORRECTLY OR ELSE YOUR GAME WILL DEFINITELY CRASH
1. 20 Pokémon in your PC box
2. Slowpoke as the 1st Pokémon in the current PC box
3. Slowpoke as the 2nd Pokémon in the current PC box
4. Slowpoke as the 3rd Pokémon in the current PC box
5. Slowpoke as the 4th Pokémon in the current PC box
6. Slowpoke as the 5th Pokémon in the current PC box
7. Slowpoke as the 6th Pokémon in the current PC box
8. Voltorb as the 7th Pokémon in the current PC box
9. Growlithe as the 8th Pokémon in the current PC box
10. Jolteon as the 9th Pokémon in the current PC box
11. Geodude as the 10th Pokémon in the current PC box
12. Geodude as the 11th Pokémon in the current PC box
13. Geodude as the 12th Pokémon in the current PC box
14. Geodude as the 13th Pokémon in the current PC box
15. Geodude as the 14th Pokémon in the current PC box
16. Geodude as the 16th Pokémon in the current PC box
17. Geodude as the 15th Pokémon in the current PC box
18. Geodude as the 17th Pokémon in the current PC box
19. Geodude as the 18th Pokémon in the current PC box
20. Geodude as the 19th Pokémon in the current PC box
21. Voltorb as the 20th Pokémon in the current PC box
22. Slowpoke as the 1st Pokémon in the current PC box
23. First PC box Pokémon needs to have 233 HP

Remember, this must be your CURRENT or ACTIVE Box!

After finishing the setup, put Pikachu on top of your party and use WS M. Done! You've taught Pikachu Surf! Now go destroy your friends' Golems and Rhydons with Pikachu

NOTE: You can also use this method to teach any move you want to any Pokemon. You just have to change the number of Lemonades to match the hex value of the move you want. If you have questions, just leave a comment.

Thanks for watching and hope you enjoy!


Acknowledgments:

Glitch City Laboratories Forum's:
TheZZAZZGlitch for the bootstrap code forums.glitchcity.info/index.php/topic,6638.msg189586.html#msg189586
Wack0 for the Change Any Byte in RAM to Anything code forums.glitchcity.info/index.php/topic,6638.msg189609.html#msg189609

and

psypokes.com/rby/ygameshark.php for the Teach Any Move Code