You may play them this turn.
Grist, the Hunger Tide is a three-mana Black and Green planeswalker that can do a bit of self-mill and make Insect tokens, sacrifice creatures to destroy creatures or planeswalkers, or drain the life from your enemies based on the number of creatures in your graveyard
Once during your turn, you may take a Psychic Energy from your Energy Zone and attach it to the active Psychic Pokemon
Before the errata changed, you can have three of these monsters on the field with this effect
Edgar provides some pseudo-wrath-protection: If your board incites the Wrath of God, Edgar Markov's Coffin helps rebuild by generating a couple tokens
The best part is that this effect isn't restricted to Grass-type Pokemon, making Butterfree a versatile choice for any deck requiring healing support during matches