Its formidable Special Defense and access to moves like Flamethrower and Will-O-Wisp enhance its role as a tactical powerhouse
As far as strategy goes if you are using more than one Espeon in your deck or another Eevee-evolution in your deck it would only make sense to have Espeon in your deck so that that other Eevee evolution would have 20 more hp
Similarly, whether the Pokmon is a massive fan-favorite can play a hand too, which is why Pikachu, Mewtwo, and Eeveelutions almost always hold some sort of value, but as for Team Rocket's Crobat ex, it's a mystery
It uses psychic waves to confuse foes and can control its surroundings with ease
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