I think you may need to use the lock/release commands for this to work correctly. Also make sure that you are warping to a valid map and X/Y position.
Code:
'---------------
#org 0x29320E
lock
msgbox 0x817476D MSG_NORMAL '"[rival]: [player], remember we wer..."
warp 0x1 0x4 0xFF 0x6 0x9
waitstate
release
end
'---------
' Strings
'---------
#org 0x17476D
= [rival]: [player], remember we were going to \nthe professors lab.\pWe were going to get our starters!
It may also require the lockall/releaseall commands instead, though.
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