If you're gonna use PKSV, you can use this script: it's your script, but altered to work with PKSV and probably with XSE aswell.
#org OFFSET HERE
msgbox DIFFERENT OFFSET
callstd MSG_FACEPLAYER
end
#org DIFFERENT OFFSET
= [red_fr]Welcome to the PokéGarden, please\ndont disturb the Pokémon while your\lhere.\lHope you enjoy your stay.
Note that XSE and PKSV, if I'm right, don't work with @offsets.