Why Sand Veil/Snow Cloak shouldn't be banned:
Banning Sand Veil and Snow Cloak as a whole will have more negative effects on the metagame than positive. Since our goal as a forum is too creative the most ideal metagame, abili-banning will be counter productive. Just in case you haven't looked it up, 26 pokemon have the abilities Sand Veil (18) and Snow Cloak (8). And 15 of these 26 (nearly 3 of 5) have only one other ability to choose from, none of which benefit them as much as their evasion does (Poison Heal being the biggest exception). You are
forcing 15 pokemon to swap up their movesets, and overall play style, just to tailor to
one dominate OU poke.
Gentlemen, ladies, i want you all to take a nice long look at something:
^That pokemon, you may very well know, has next to no counters in Sandstorm, which is an extremely common condition (21% usage Ttar+5% usage Hippo= roughly 26% of teams). As often as occasion permits, this pokemon will switch in, and get a free Sub/SD on your switch out. On a
fair switch in (meaning Chomp is brought in the same turn as an opponents pokemon), assuming leftovers, Chomp has 5 turns to spam Sub before he runs out of HP. With Sand Veil's 20% miss ratio, this gives him a
statistically guaranteed free turn, which he can use to hit you with his
unresisted STABs or set up a free Swords Dance. So no matter how good you are at the game, no matter how well you outplay your opponent, this pokemon gives them an opportunity to turn things around, statistically, 100% of the time.
I know i'm not the only one who remembers how broken Sand Veil SubChomp became in Gen 4. That thing swept hole teams. Fuck, people switched it in turn two, right after they got SS and SR up. And although there have been added counters to it in Gen 5, it still is reaching that broken/OP mark again, being on 18.3% of teams. But, as you may recall, it never really found it's niche in 4th Gen Ubers, being outclassed by almost all other Scarf Revengers, and it won't accomplish much in Gen 5 Ubers either.
Proposals on how to deal with it:
1. Specific abili-ban. Just like I believe only certain pokemon should be stripped of Swift Swim and Chlorophyll, only Garchomp should be robbed of Sand Veil. The 18 Sand Veil users should not be hindered, just because one of them can actually abuse the ability. And aint no way in hell the 8 Snow Cloakers should be hindered, just because of a brother ability, who only one user can abuse. Hail teams are barely useable as is, they could really do without the banning one of their only usable abilities.
2. Ban the combination of Sand Stream and Sand Veil. Keep in mind this still forces changes to other Sand Veil users, but it's better than banning Sand Veil altogether.