no it can't.
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Most Pokemon can learn that move think of it this way Pokemon that have hands can learn it some Pokemon learn it from the move tutors however some can learn it via egg move only.
defog is not in emerald,
A list of Pokemon that can learn foresight is:VenonatVenomothMachopMachokeMachampHitmonleeHoothootNoctowlYanmaMudkipMarshtompSwampertSableyeDuskull Dusclops
Salamence can only learn Hydro Pump as an egg move in Pokemon Emerald.
golbat can learn mean look