To ensure that Espeon ex is as hard to kill as possible, Id suggest running at least one copy of Giant Cape to get an extra sliver of HP on there
He's far from the most popular trainer in the TCG, and while some Ultra Rares aren't always as valuable as the best options, this card doesn't look as boring as the price would suggest
Sure, your removal spell is likely downgrading a much bigger threat, but there are plenty of options that simply remove a threat instead of making it a slightly less threatening threat, that is, by all means, still a creature that matters
And being a stage 2 Pokmon without a very specific support doesnt help as well
In the TCG, using a Buddy-Buddy Poffin card will allow you to search your deck for up to two Basic Pokemon who have 70 HP or less before putting them directly onto your bench