Is that an actual question? Or a statement? They all came out of the same packs, so they all should be 100% authentic. They have the pokemon TM and the packs they came out of are exactly the same packs.
I have no idea, I haven't collected newer pokemon xy cards before so I assumed they were just like other common cards and uncommon that can be regular, holographic and then reverse holographic
I bought pokemon cards from wish.com and they were all fake. They looked real but they weren't. And they were "holo", I think it's always a good idea to have someone else check them out if you aren't sure. Just a suggestion.
Sadly yes they do make fakes and even whole fake booster boxes that sell for like $18. From what I can see, Rayquaza, Ampharos and Tyranitar are fake but from Hoopa to the right, (Giratina and the secret rare) are real, so you should get a good amount of credits for those definitely! :-)
I got some information from a friend who plays pokemon constantly, and he informed me about 85% of EX cards that are real are holographic and the other 15% are from precon packs which I don't understand what precon means but it's pokemon.. they're always changing things.. they started with 151 of them and now there's 718 or so.