Así que te dejo por acá el de FireRed, ya que no aclaraste qué base usás/querés xD
Iniciado por Script Surf FireRed
'---------------
#org 0x1A6AC8
special 0x187
compare LASTRESULT 0x2
if 0x1 goto 0x81A6B0C
checkattack 0x39
compare LASTRESULT 0x6
if 0x1 goto 0x81A6B0C
bufferpartypokemon 0x0 LASTRESULT
setanimation 0x0 LASTRESULT
lockall
msgbox 0x81A556E MSG_YESNO '"The water is dyed a deep blue[.]\n..."
compare LASTRESULT 0x0
if 0x1 goto 0x81A6B0B
msgbox 0x81A55A5 MSG_KEEPOPEN '" used SURF!"
doanimation 0x9
releaseall
end
'---------------
#org 0x1A6B0C
end
'---------------
#org 0x1A6B0B
releaseall
end
'---------
' Strings
'---------
#org 0x1A556E
= The water is dyed a deep blue[.]\nWould you like to SURF?
#org 0x1A55A5
= used SURF!
Como ahí dice, lo encontré en el offset 1A6AC8
Espero que te sirva de algo.