what can I do as a support to prevent myself and the ADC from being ganked by shaco?

do pink wards reveal him when he goes invisible? where should i place my pink wards if they do? where should i place the regular wards, and I know that oracle will let me see where he is, but i have to get lucky with that. are there certain supps i should go for when he goes jg? right now i play sona, nami, raka, and morg.
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