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Jolteon worthy of a charge TM?
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Or keep an eye out for T3 Jolteon raids.
However, this one is already maxed out with excellent IVs, so the question is really:
Is stardust or TMs more valuable? Either Discharge or Thunderbolt will be better, and it will be difficult/unlikely to catch or evolve another Jolteon with as close IVs and then power it up.