Ok I read the entire first post and skimmed the responses, so here is mine. But before that i want to say this is an EXTRMELY good article. It does not just go "ban this" it gives reason and supports the evidence.
Possible bans/restrictions besides Gardevoir:
1. Dusknoir and Crawdaunt ex: Dusknoir makes the deck truly disgusting when combined with the other broken combos in GG. By banning it, you would eliminate one of the most frustrating and unpreventable aspects of GG and the format. Of course, you would also have to ban Crawdaunt ex as it is still broken when combined with Team Galactic's Wager and Psychic Lock. Although it's attack isn't as effective as Hard Feelings, Crawdaunt ex would still be annoying and lame.
I do not like this simply because both Dusknoir and Craudaunt ex are used in other decks, I think that would do more then effect GG.
2. Gallade: Psychic Lock would still be a powerful deck, but without the use of its big hitter, the deck wouldn't be dominant. Gallade makes for donking the opponent an option, it wins sudden death and it is basically uncounterable as well. This would be a good ban.
With Gallade, again because alone the card is not as broken, banning it would not be as effective IMO as getting rid of Gardy.
3. Restricting Gardevoir and Gallade: What I mean by this is that you wouldn't be able to use both Gardevoir and Gallade in the same deck. They would have to be in separate decks. This would make it so you don't have the broken combo together. It is truly unbalanced that both can fit in a deck and come from Ralts/Rare Candy or Kirlia.
This is personally my favorite of the 3. It allows the cards to BOTH be playable and thus neither is banned, but severley limits how far each card can go.
To all the people saying "DON"T BAN IT" "THAT IS STUPID" "GG IS NOT THAT GOOD" take the following into consideration.
-Some of the best players 3+ years running all hate the deck DESPITE that is potentially has the best chance of winning.
-Pokemon has YET to ban a card under Nintendo's reign. In fact they have been extremely generous in this fact that other cards like Blaze EX MA and such were never banned. However I have yet to see a deck as domiate as GG in the last 5 seasons I have played. Everytime a new set came out, many people assume GG would go the way of blissey, but it did not.
-There are more decks then GG out there and if the third option is used then Pl0x is still an option
Once again, great article, I agree 100%