For now the deck is pretty strait forward but if cards like lilligant (hisuian) takes a major role in the format and also, when it's release, charizard radiant you can easily bring out both jolteon and another one or glaceon and the eevolution that you need in that specific moment.
After pokemon go i personaly woud recommend buying the slowbro-slowpoke and the snorlax (maybe the poke stop too) for every stall/control type of deck and when it's out the card that let you mill opponents item (i forgot the name sorry).