It is a standard size, with a gold foil finish and reprint features
TCG Pocket's battles are indeed slimmed down a little from the standard real-world ones (and those of the somewhat quaint-by-comparison TCG Live and TCG Online, which replicate the real-world ones precisely)
You can pump Hellkite Igniter to infinity and beyond, Hoard-Smelter Dragon becomes 3R: Destroy anything, and you can take every permanent from a player with Hellkite Tyrant
I go over a few different ways to do it, depending on what you want from your custom cards
Yes, they are hard to cast, but two of them are clearly the best, with the other three still being good but not game-breakers the same way
Pokmon Symbol You may encounter some cards that feature a colored symbol of a specific Pokmon rather than a traditional rarity symbol