CardMakerCreator is one of the best, if not the best. You can set HP up to 999, change attacks into abilities, and even use different themes! My only, small complaint, is that the weakness and resistance numbers only allow for “x”(times) numbers. I think their should also be addition and subtraction for it. So if attacked by a Pokémon that you’re weak against, then add 20 damage to that attack.
Now, if the developers would want to make CardMakerCreator even better, I have a couple tips of how you could do it. First, add the ability to add Item, Tool, Trainer, Supporter, and Stadium cards. This would add a huge aspect to the game, and create new ways to combo with your cards. I feel this is the most important one.
Also, you could add energy cards. The main energies, double energies, rainbow, plasm, special, and more. The only thing needed to be done with this, would be the ability to do double regular energies.