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Blisseys best move set.
Time.
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Facing a 3100 CP Blissey especially with DG will cause a timing out issue unless you're a high level trainer with access to high CP attack mons. Also timing out is a real problem for prestiging which will prevent prestigers of gaining 1000 points because you'll be forced to use a prestiger with higher than usual CP and get around 500 points instead or less. So yeah, time is Blisseys best tool.