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Yes, speed boost stored power is good, but have looked at Espathra's other ability? Oppurtunist makes it so that when the opponent boosts stats, so do you.
:espathra::lucario::Hydreigon::oricorio-sensu::gastrodon::toedscruel:
Espathra @ Choice Specs
Ability: Opportunist
Tera Type: Fairy
EVs...
Hey, you've been subbed in as my opponent for the Pu open. I'm available all weekdays between 7 and 12 pm +1 GMT. Sunday is also possible if you have time then.