Let me tell you why you don't understand ban lists.
This ban list basically hits every big deck in the format (ignoring Tropical Beach for whatever reason, but alright). You can't just hit every good deck and expect to have a balanced format. Much more work is put into ban lists of other games. Days of playtesting, I'm sure. Your bans are completely indiscriminate. This creates a totally different format, and it doesn't cater to people, or make it more competitive. The list is obviously untested, and new decks will rise to fill the shoes of the ones that were either nerfed or destroyed. There is nothing saying those new decks won't be just as broken, if not more broken, in the new metagame that you have created. This only will require more bans by your logic. There will always be best decks that people will complain about in EVERY format, including the one that you are creating. You have to ask yourself, what does banning Yveltal, G Booster, and others, enable to be good? And also, what cards are overpowered in a format without those current top cards? Well, it's clear that you didn't do that.
You're not helping the metagame or the format. You're completely altering it without extensive forethought or testing. The point of bans and restrictions are to remove toxic or broken decks from the format. While it could be argued that that is the case for every top deck right now, it looks like you're just picking decks to nerf based on popularity, which is completely backward and wrong. Mega Charizard SUCKS. Now, if you hadn't so rashly banned it, it might actually be able to succeed in a format without Rayboar or Yveltal being threats. All you needed to do to dark decks was to ban Yveltal. You didn't have to hit Sableye, Dark Claw, and others.
If I had to make a ban list, one card would be on it - Hypnotoxic Laser. With some many Plus Power type cards already in the format, Laser creates a format the revolves around one shots. Laser is the enabler behind this, putting many hits for 140 put to the magic 170 number. Laser creates a metagame where the best strategy is to get ahead quickly, and rely on drawing cards, like Laser, that let you trade your way to victory.
But all of that pales in comparison to this injustice.
Why are you biased against Leafeon.