Is it a good idea to trade mewtwo with another mewtwo to reroll

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I want to trade for a shiny armoured Mewtwo but only have 300,000 stardust. I already have a normal shiny Mewtwo so do I still need 1,000,000 Stardust or do I only

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Uberjudgement on X: So met up with a local for a lucky trade and only had 1 shiny with Psystrike to reroll..Shundo #4! Only have 40 XLs but I'm maxing this out

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Is it a good idea to trade mewtwo with another mewtwo to reroll ivs? : r/TheSilphRoad

Lucky Mewtwo and Reshiram trade! : r/pokemongo

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