I'm shocked that these decks include Ancient Trait cards!
These are at least decent for beginning players. The Trainer selection is strong (glad to see Teammates and new Stadiums) and varied.
The Pokemon themselves are pretty mediocre, though. Whiscash, Manectric, Medicham, and Milotic are nice additions, but I don't think they justify how many unfinished evolution lines are.
Why is there not a single Fully-evolved Fire Type in Ocean Core? They could have gone with Magcargo, since it's Uncommon, but whatever.
Overall, I'd say the better of these decks would be Earth Pulse. Earth Pulse at least has a variety of 'ok' attackers that can help. When playing in a Theme Deck battle, Groudon does 100, Rhyperior can spread for 20-40 or hit for 80-120, Manectric does 70 and Paralyzes, Medicham hits 60 for 2, and Bibarel relies on luck but can at least try.
Ocean Core just doesn't have enough Evolved Pokemon to be strong, meaning that once your Kyogre line and Whiscash get KO'd, you're pretty much out of attackers. In Theme Deck matches, Kyogre does only about 80, Whiscash can do 120, and that's about it. Walrein is too limited to be strong because base damage is 70, Milotic isn't strong enough at 60 for 3, and everything else hits at just around 30-40.