In most scenarios.
Pokemon Trainers around the world have been trying to acquire a Hoopa with a Brave Nature and high Attack IVs so they could one-hit KO an Aegislash in Shield Forme.
I went from being happy to being disappointed after I acquired a Hoopa with a Brave Nature, because its Attack IV is only 7 points (out of 31), which is far to weak to one-hit KO an Aegislash in Shield Forme. Listed below are the stats for my pathetic Hoopa:
Nature: Brave (+10% Attack; -10% Speed).
IVs:
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HP: 31
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Attack: 7
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Defense: 31
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Special Attack: 21
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Special Defense: 19
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Speed: 31
It's like Game Freak slapped me in the face when they gave me that Pokemon that lost just about every battle against an Aegislash. If you want to beat my Hoopa, simply have your Aegislash use False Swipe followed by Shadow Sneak...