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Serena is a pretty lousy Pokemon trainer. Using nothing but her postgame team, let's help her git gud!
Hard mode: she's caught more than six Pokemon, so why don't we use them?
Here's the mons she owns: Bunnelby, Fletchling, Meowstic, Absol, Eeveelution, Altaria, Clefable, Kalos starter, Kanto starter, fossil-mon.
There's some pretty bro-tier mons in there, so it can't be that hard to make her into a challenging opponent.