Disclaimer: this is a rough decklist idea I have come up with for the upcoming Gardevoir & Sylveon GX and, as such, some of the cards listed may not be out yet; I will include the Pokebeach translations below the decklist for those who do not know their effects.
Additionally, I will be using "UNB" as the set abbreviation for Unbroken Bonds (don't know if this is correct yet but it should help to indicate).
Pokemon (16)
3 Gardevoir & Sylveon GX UNB
4 Cutiefly LOT
3 Ribombee LOT
1 Ribombee BUS
2 Cottonee GUR
2 Whimsicott GX UNB
1 Ditto Prism Star LOT
Trainers (33)
4 Cynthia ULP
4 Professor Elm's Lecture LOT
3 Pokegear 3.0 UNB
3 Ultra Ball SUM
3 Nest Ball SUM
2 Guzma BUS
3 Tate & Liza CES
2 Erika's Hospitality TEU
2 Acerola BUS
1 Max Potion GUR
1 Wonderous Labyrinth Prism TEU
1 Adventure Bag LOT
2 Fairy Charm UB TEU
1 Fairy Charm Ability UNB
1 Fairy Charm [L] UNB
Energy (11)
11 Fairy Energy (Basic energy, no specific set)
Unreleased cards & their effects
Gardevoir & Sylveon-GX – Fairy – HP260
Basic Pokemon (TAG TEAM)
[C] Fairy Song: Search your deck for up to 2 [Y] Energy and attach them to your Benched Pokemon in any way you like. Then, shuffle your deck.
[Y][Y][C] Kaleidostorm: 150 damage. Choose any number of Energy attached to your Pokemon in play and rearrange them in any way you like.
[Y][Y][Y]+ Magical Miracle GX: 200 damage. If you have 3 extra [Y] Energy attached to this Pokemon (in addition to this attack’s Energy cost), your opponent shuffles their hand into their deck. (You can’t use more than 1 GX attack in a game.)
When your TAG TEAM is Knocked Out, your opponent takes 3 Prize cards.
Weakness: Metal (x2)
Resistance: Darkness (-20)
Retreat: 2
Whimsicott-GX – Fairy – HP190
Stage 1 – Evolves from Cottonee
Ability: Fluffy Cotton
If any damage is done to this Pokemon by attacks, flip a coin. If heads, prevent that damage.
[Y] Energy Blow: 10+ damage. This attack does 30 more damage times the amount of Energy attached to this Pokemon.
[Y] Toy Box GX: Search your deck for up to 5 cards and put them into your hand. Then, shuffle your deck. (You can’t use more than 1 GX attack in a game.)
When your Pokemon-GX is Knocked Out, your opponent takes 2 Prize cards.
Weakness: Metal (x2)
Resistance: Darkness (-20)
Retreat: 1
PokeGear 3.0 – Trainer
Item
Look at the top 7 cards of your deck. Choose 1 Supporter card you may find there, reveal it, and put it in your hand. Then, shuffle the rest of your cards into your deck.
You may play as many Item cards as you like during your turn (before your attack).
Fairy Charm Ability – Trainer
Item
Pokemon Tool: Attach a Pokemon Tool to 1 of your Pokemon that doesn’t already have a Pokemon Tool attached to it.
Prevent all damage done to the [Y] Pokemon this card is attached to by the attacks of your opponent’s Pokemon-GX and Pokemon-EX with Abilities.
You may play as many Item cards as you like during your turn (before your attack).
Fairy Charm [L] – Trainer
Item
Pokemon Tool: Attach a Pokemon Tool to 1 of your Pokemon that doesn’t already have a Pokemon Tool attached to it.
Prevent all damage done to the [Y] Pokemon that this card is attached to by the attacks of your opponent’s [L] Pokemon-GX and Pokemon-EX.
You may play as many Item cards as you like during your turn (before your attack).
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Let me know what you guys think of the list so far
Additionally, I will be using "UNB" as the set abbreviation for Unbroken Bonds (don't know if this is correct yet but it should help to indicate).
Pokemon (16)
3 Gardevoir & Sylveon GX UNB
4 Cutiefly LOT
3 Ribombee LOT
1 Ribombee BUS
2 Cottonee GUR
2 Whimsicott GX UNB
1 Ditto Prism Star LOT
Trainers (33)
4 Cynthia ULP
4 Professor Elm's Lecture LOT
3 Pokegear 3.0 UNB
3 Ultra Ball SUM
3 Nest Ball SUM
2 Guzma BUS
3 Tate & Liza CES
2 Erika's Hospitality TEU
2 Acerola BUS
1 Max Potion GUR
1 Wonderous Labyrinth Prism TEU
1 Adventure Bag LOT
2 Fairy Charm UB TEU
1 Fairy Charm Ability UNB
1 Fairy Charm [L] UNB
Energy (11)
11 Fairy Energy (Basic energy, no specific set)
Unreleased cards & their effects
Gardevoir & Sylveon-GX – Fairy – HP260
Basic Pokemon (TAG TEAM)
[C] Fairy Song: Search your deck for up to 2 [Y] Energy and attach them to your Benched Pokemon in any way you like. Then, shuffle your deck.
[Y][Y][C] Kaleidostorm: 150 damage. Choose any number of Energy attached to your Pokemon in play and rearrange them in any way you like.
[Y][Y][Y]+ Magical Miracle GX: 200 damage. If you have 3 extra [Y] Energy attached to this Pokemon (in addition to this attack’s Energy cost), your opponent shuffles their hand into their deck. (You can’t use more than 1 GX attack in a game.)
When your TAG TEAM is Knocked Out, your opponent takes 3 Prize cards.
Weakness: Metal (x2)
Resistance: Darkness (-20)
Retreat: 2
Whimsicott-GX – Fairy – HP190
Stage 1 – Evolves from Cottonee
Ability: Fluffy Cotton
If any damage is done to this Pokemon by attacks, flip a coin. If heads, prevent that damage.
[Y] Energy Blow: 10+ damage. This attack does 30 more damage times the amount of Energy attached to this Pokemon.
[Y] Toy Box GX: Search your deck for up to 5 cards and put them into your hand. Then, shuffle your deck. (You can’t use more than 1 GX attack in a game.)
When your Pokemon-GX is Knocked Out, your opponent takes 2 Prize cards.
Weakness: Metal (x2)
Resistance: Darkness (-20)
Retreat: 1
PokeGear 3.0 – Trainer
Item
Look at the top 7 cards of your deck. Choose 1 Supporter card you may find there, reveal it, and put it in your hand. Then, shuffle the rest of your cards into your deck.
You may play as many Item cards as you like during your turn (before your attack).
Fairy Charm Ability – Trainer
Item
Pokemon Tool: Attach a Pokemon Tool to 1 of your Pokemon that doesn’t already have a Pokemon Tool attached to it.
Prevent all damage done to the [Y] Pokemon this card is attached to by the attacks of your opponent’s Pokemon-GX and Pokemon-EX with Abilities.
You may play as many Item cards as you like during your turn (before your attack).
Fairy Charm [L] – Trainer
Item
Pokemon Tool: Attach a Pokemon Tool to 1 of your Pokemon that doesn’t already have a Pokemon Tool attached to it.
Prevent all damage done to the [Y] Pokemon that this card is attached to by the attacks of your opponent’s [L] Pokemon-GX and Pokemon-EX.
You may play as many Item cards as you like during your turn (before your attack).
__________________________________________________________________________
Let me know what you guys think of the list so far