You're on a hard spot. The game being so competitive, is hard for young players, even with the best cards as most of the best decks are "easy to play, but hard to master".
Think that Unlimited is a jungle. Everything is allowed! So all tricky cards and dirt combos will be in play, probably. It would be better to limit a bit the rules playing Expanded, where there is without any doubt a competitive scene but not so top as in Standard, and not so exclusive as in Legacy. With a casual deck, you should maintain your average rating about 50% and face a wide range of good to casual decks, still funny, but just my opinion..
As for the deck... although probably the most loved pokémon ever, Charizard cards have never been so good. Good thing of fire is hits hard, but on the other side use to need a lot of energy to do it.
The combo with Lighting doesn't seem the best. That's what happens with feelings over reason (aka competition). Yes I also tried with Char... the 1st deck I tried was Charizard EX, when XY was last set released and I was starting to play. I had some wins but never worked really at a high level. Never got the support cards and partner pokémon to do it. A pity. And I can say, if anytime Charizard have a competitive deck, will be probably the most played deck ever
Anyway, casual or competitive play, to improve a bit you ned around 16 pokémon as much, up to 34 trainers, and go with 16 energies as much, because is fire. A standard competitive deck runs 8-14, not more.
Remove the Ninetales line. At least that EVO Ninetales doesn't seem to help so much. Also 4-2-4 Charizard with 3 or 4 Candies would be great. You win 6 spots.
You need 4 Vs Seeker and 1 ACE SPEC (there are some that are not expensive, get a look to all). Those are great cards for Expanded. 5 spots filled!
Another must is 4 Ultra ball. Level ball, Heavy ball and Nest ball are other helpful ways to search for some pokémon.
Another Blacksmith could be great. Battle compressor it's a combo that could be interesting (discard energies, then blacksmith to a pokémon).
I would remove 1 Energy retrieval to add a Super rod. Another good card to recover some resources is Rescue stretcher.
Add 2 N. Will help late game and disrupting opponent at the same time. Early game draws 5-6 cards.
If you can manage to get the 4 Vs seeker, cut Lysandre to 2 (or 1 and 1 Guzma)
1 copy of Lillie is interesting. Also a couple Brigette.
Things like Field blower, Choice band and Float stone are a must in a lot of decks. Evosoda,or Professor letter could be a good help.
Raichu is not bad but Thunderbolt it's a bad attack (needs a lot of energy and discards also a lot) so I wouldn't play any of the Lighting energy. Get some help to hit hard with the Choice band or Muscle band and a stadium like Sky field. Another interesting stadium could be Scorched earth (again, the energies> blacksmith combo and no need of B compressors, although those are good with Vs seeker also, not only with energies).
You can get some of that cards from Theme decks from the shop (500 coins). I suggest you get Mach strike and play Theme now and then to get the coins needed to get the next Theme deck, the one that includes some cards you're looking for. You already have some of the mentioned cards in collection when starting the game (the 2 N, 4 UB, 1 Vs seeker, and some more).
I know it's a lot to process and it's not easy to get the right cards always but, if you make some change, let us know how it's working to go on with more tips if needed.
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