This is officially the last post I will acknowledge as being worthy of my time that involves telling people what rules to give their tournaments.
For the eleven billionth time, it's not your business to tell people what rules their tournaments have. And I don't ban Legendaries because they are unique. Quite the contrary, I ban them because they are so overused it's not even funny. If I want to ban Legendaries because I want to see some original and creative teams, then you have two choices. The first is to suck it up and join without complaining. The second is to leave the thread without a word. And there is no way to remove luck from the game. No matter what, there's always the possibility that you'll miss, there's always the chance that the attack you get hit with is a critical hit, or that if you use Magnitude it will come out high numbered.
But then we look at Double Team, or Sand Attack. Those are moves that alter the luck of the game. Now, let's look at other games of chance. How about Monopoly. You're piece is standing on the home square. In front of you are two purple spaces, the tax space, a Chance card, three light blue spaces, a Community Chest space, Visiting jail, two pink spaces, and another Community Chest. There is ALWAYS going to be a 1/6 (2/12) chance that you will land on the purple, ALWAYS a 1/12 chance of landing on Chance, ALWAYS a 1/12 chance of landing on Chance, ALWAYS a 1/6 (2/12) Chance of landing on a Community Chest, ALWAYS a 1/4 (3/12) chance of landing on a light blue, ALWAYS a 1/6 (2/12) chance of landing on a pink space, and ALWAYS a 1/12 chance of landing on Visiting Jail. There is NO way to legitimately change those odds, and any attempts at changing the odds are cheating.
Now, quite clearly DT isn't cheaating. Howeverr, when you change the odds of a game, you're not playing the same game. If you have a bag of 15 yellow cubes, 11 blue cubes and one pink cube, and you're trying to get the pink cube, but then you take out one yellow cube, you're not playing "pick a pink cube out of a bag of 15 yellow cubes, 11 blue cubes and one pink cube", you're playing "pick a pink cube out of a bag of 14 yellow cubes, 11 blue cubes and one pink cube". If you're playing roulette, and you shrink the roulette so that one of the spaces becomes missing, you're not playing the same game anymore. Take a suit out of a deck of cards, you're not playing the same game of poker. Because it has different odds.
And therefore, when you use DT or Sand Attack or any moves like those, you are altering the probability. This does not hold true for things like Attack, Defense or anything like that, because damage isn't a probability unless counting CH. Moves like Night Slash which naturally have higher CH rates don't count, because those moves are not part of the probabilities that alter the equation, they are part of the equation itself. Strategy should not rely on altering luck to alter the outcome, in any situation.
Only in the most life-threatening should we depend upon luck instead of our own skill, because everyone is exactly as lucky as everyone else. Changing luck doesn't prove a thing, only that you're doing something cheap. The alteration of luck unbalances the equation of a battle, causing it to become screwed up. That is my final defense of evasion/accuracy modifier bans, and it will not change, because no argument I could think of could hold as steady as that.