Pokémon
Exeggutor ex x2
Exeggcute x2
Caterpie x2
Metapod x2
Butterfree x2
Trainers
Erika x1
Sabrina x2
Potion x1
X Speed x2
Poké Ball x2
Professor's Research x2
Strategy
Tried all variations of Exeggutor EX decks and this is most flexible & balanced one that carried me to 50 wins.
Set up: Always try to open with Caterpie to protect the first Exeggcute and draw an extra Pokemon. If all goes to plan you'll able to swap an Exeggutor in by turn 2-3 to tank/trample the opponent's opener (Early Sabrina draw should help here - you don't really need it after the Exeggutors are set up).
Mid to late game: Build your Butterfrees on the bench but the goal is to ensure the survival of your first Exeggutor while getting the second one ready. Only attach energy to Exeggutors to prepare for late game. Use all your supporters and items here if needed. I find bringing 1x Erika and 1x Potion can come in really handy to help recover from bigger hits. Also you can swap in a Butterfree to take a hit if needed.
Late game: Swap between Exeggutors and recover with Butterfree, save up X Speed for this phase if you can. With full setup it should be a pretty comfortable win even with bad coin flips.
PS: If you feel like the first Exeggutor is going to fall before the second one is ready, start attaching energy to a Butterfree - this strategy is equally effective by using Butterfree x Exeggutor swaps.