I did it by having a variable to track how far along the "scenery" my character was, and adding that variable to the location of any enemies. Then Hiding the enemy if the variable was big enough to put them off-screen.
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I just said like : [blocks]<when green flag clicked>[/blocks]
[blocks]<forever>[/blocks]
[blocks]<set x to( <{(( ((scrollx <+>(( 480 <*> number )) )) <+>100 ))= )) }>[/blocks]
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