As most of these fun decks go with me, I have found inspiration from other players talking about ideas for interesting decks. This list uses Alolan Marowak to power up Palkia GX. Best part is that since Marowak doesn't discriminate where the energies go, I can play the dragon Palkia to some effect. Yeah I know Aqua Patch doesn't work for the dragon type but Volcanion's attack is nothing to scoff at either.
2 Cubone
2 Alolan Marowak (FBL)
1 Volcanion Prism Star
1 Palkia GX (Water)
3 Palkia GX (Dragon)
2 Oranguru (Instruct)
1 Latios (SHL)
2 Tapu Lele GX
3 Devoured Field
3 Aqua Patch
4 Nest Ball
3 Ultra Ball
2 Rescue Stretcher
2 Switch
3 Cynthia
1 Judge
1 Hau
2 Choice Band
2 Professor Kukui
3 Guzma
3 Field Blower
11 Water Energy
2 DCE
Ideally you want to get Alolan Marowak up ASAP and get the energy rolling. I chose to go heavy with the dragon type Palkia but that could change if Gardy becomes a thing. I almost didn't include the Lele's but it is Lele. I could drop it down to 1 and replace it with another Water energy. I know the energy seems like a lot but I do a lot of discarding. Articuno GX is something I could toy around with as a secondary attacker.
2 Cubone
2 Alolan Marowak (FBL)
1 Volcanion Prism Star
1 Palkia GX (Water)
3 Palkia GX (Dragon)
2 Oranguru (Instruct)
1 Latios (SHL)
2 Tapu Lele GX
3 Devoured Field
3 Aqua Patch
4 Nest Ball
3 Ultra Ball
2 Rescue Stretcher
2 Switch
3 Cynthia
1 Judge
1 Hau
2 Choice Band
2 Professor Kukui
3 Guzma
3 Field Blower
11 Water Energy
2 DCE
Ideally you want to get Alolan Marowak up ASAP and get the energy rolling. I chose to go heavy with the dragon type Palkia but that could change if Gardy becomes a thing. I almost didn't include the Lele's but it is Lele. I could drop it down to 1 and replace it with another Water energy. I know the energy seems like a lot but I do a lot of discarding. Articuno GX is something I could toy around with as a secondary attacker.