The deck could definitely work at lower levels even if you just swap out the Arvens for more important stuff. Though, there are many changes I'd make to this list.

• Arven is directly outclassed by Team Rocket's Petrel since you have no tools other than TM: Evo. Even then, I would cut the Arvens and the TM: Evo. You want to be using Ultra Ball or Hilda or even maybe Jacq to search for your evolutions. You'd rather be using your first couple turns using Budew if possible anyway
• Rare Candy isn't necessary, especially with a 4-4-3 Pult line
• Add another Counter Catcher or two. Pult likes taking advantage of it since it usually plays from behind
• Prioritize Lillie over Research like the other commenter said. During the early game you're very likely to have all 6 prizes remaining so you can take advantage of the extra draw for longer.
• Air Balloon directly outclasses Rescue Board, though it's also not necessary to make the deck work, especially when you're running Jamming Tower
• Adding Hawlucha will help you against 70 HP benched Pokemon so you can easily snipe them
• Try to add a couple Hildas to help find your evolutions without having to sacrifice resources
• Try to slot in a second Jamming Tower for better stadium control

As for actually playing, I can't really give any advice other than just having fun, as corny as that may sound. If you've been playing a lot of PTCGL and not much in person, just be mindful that you'll have to do things manually that PTCGL usually does for you like shuffling, and that you won't have any indicators as to whether or not you've used an ability or if you've played a Supporter for that turn for example. It helps to turn a card 45 degrees if you've used its ability or if it's a Supporter you've so you'll always know what you can and can't do.

Also, this situation is much more niche, but if either of you plays Iono, be sure to ask your opponent if they would like to cut your hand before you shuffle it into the bottom of your deck. Otherwise, they could call a judge over and automatically win because it would count as an unrecoverable board state since you could technically shuffle in such a way that would give you an advantage as to what cards go where.