It has a very high RBI and an excellent control-taking effect, so once you can call it, you can play an active role
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Once its VSTAR form is on the field, Zoroark can discard your hand and let you replace it with seven new cards in addition to having a low-cost attack that can deal as much as 300 damage at full power
Another strategy I would use with Espeon would be to wait until my opponent has a Pokemon in play that has a lot of energy cards attached to it, then I would put Espeon into the active Pokemon spot, either use Hypnosis first so Espeon would be able to last longer without being knocked out, or just go straight ahead and use Psywave which should be able to do 60 damage to a Pokemon that is a stage 2 Pokemon