Trevenant is seeing an uptick in Expanded as of recent. This notoriety of Psychic Tapu Lele will REALLY put it on everyones radar.
The real question is if this will replace Espeon-EX within the deck, as deckspace is (and always has been) pretty tight. Espeon-EX and Psychic Tapu Lele both achieve the same means, but are different in execution.
At least, I don't see both cards being within the same deck. If anyone has a counterpoint to that, by all means, explain!
There are some decks that, if they replace Espeon-EX with Tapu Lele, the Trevenant matchup becomes VERY managable.