Hey Pokebeach!!! Dusk Mane Necrozma didn't really work well when it first came out in Ultra Prism. However, now that the meta has slowed down a bit, this deck has lots of potential.
Pokemon (13)
4x Dusk Mane Necrozma-GX
3x Magnemite
3x Magnezone
2x Tapu Lele-GX
1x Shining Lugia
Trainers (34)
4x Cynthia
2x Volkner
2x Fisherman
2x Lillie
3x Guzma
4X Ultra Ball
4x Rare Candy
3x Energy Retrieval
3x Beast Ring
3x Nest Ball
4x Mt. Coronet
Energy (13)
12x Metal
1x Beast Energy Prism Star
So you just want to set up Magnezone Turn 2 so you can attach unlimited energy and try to hit 210 each turn (240 w/ Beast Energy).
Pokemon (13)
4x Dusk Mane Necrozma-GX
3x Magnemite
3x Magnezone
2x Tapu Lele-GX
1x Shining Lugia
Trainers (34)
4x Cynthia
2x Volkner
2x Fisherman
2x Lillie
3x Guzma
4X Ultra Ball
4x Rare Candy
3x Energy Retrieval
3x Beast Ring
3x Nest Ball
4x Mt. Coronet
Energy (13)
12x Metal
1x Beast Energy Prism Star
So you just want to set up Magnezone Turn 2 so you can attach unlimited energy and try to hit 210 each turn (240 w/ Beast Energy).