First GLC (I'm doing a custom GLC with only Sun and Moon and beyond cards!)
Main Attackers:
Black Kyurem: ...I made this deck 5 days ago, I don't know why I added this in here
Kyogre: This Pokemon can do some massive damage! Paired up with Frosmoth, it will be pretty quick!
Veluza + Wishiwashi: Basically some mass damage with water energy
Articuno: Also doing some big damage with only 3 energy!
Supporting Pokemon:
Inteleon Line: With Shady Dealings, you can get trainer cards fast!
Phione: With its ability, you can make your opponent switch out!
...You know why the trainers are there, so I'm not explaining
Strat:
Too lazy, just gonna say: Get one of the main attackers in, then well, yeah just go (Black Kyurem recommended to be first priority) But remember to get Frosmoth after that