Might replace Staryu/Starmie in the deck instead of Octilary. Don't agree with some of the choices but the consensus seems to think that Octilary should be taken out.I think your list has a lot of good set pieces, but I don't know if they will combo well. Here are the changes I would make.
-1 Tapu Lele GX
-1 Remoraid
-1 Octillery
-4 Professor's Letter
-1 Fisherman
-3 Brooklet Hill
-4 Choice Band
-4 Fire Energy
+2 Staryu
+2 Starmie
+1 Ho Oh GX
+1 Professor Sycamore
+1 Float Stone
+1 Guzma
+2 Max Elixir
+3 Scorched Earth
+2 Nest Ball
+1 Mallow
+1 Kiawe
+1 Acerola
+2 Altar of the Sunne
+4 Burning Energy
These are some pretty big changes, and I could understand if you don't think they will work. I'll go over some of my bigger changes now. I dropped the Octillery line for a Starmie line because Starmie works way better with Volcanion EX, and it's Steam Up ability. That is also why I dropped the Brooklet Hill's for Scorched Earth because I can setup fast enough without Brooklet Hill, and Scorched is way better with Starmie throughout the game. You can also combo Scorched Earth with Mallow. You use Mallow put two cards you want on top of your deck, and Scorched Earth them into your hand. I added a Ho Oh GX and 2 Altar of the Sunne's because there are so many good water decks in the upcoming format. I dropped 4 Fire Energy for 4 Burning Energy because when you use Kiawe you don't have to pull basic energy. Couple of changes I made was I dropped the Choice Band's because there are few pokemon Turtanator can't OHKO if you have two Volcanion's in the Steam Up cycle. You are hitting for 220, and two of the few pokemon above that are Metagross, and Solgaleo which are weak to fire. Those are most of the big changes. Also this list is making changes to your updated list, and these changes would make you have 60 cards. I hope this helps.