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Shoesan, you appear to be mixing up Sneak Attack and Flanking.

Two creatures already have flanking as a free power (Goblin Champion and Halfling Sneak.) Sneak Attack is a specific attack with a set amount of damage. And as Dark Angel said: the only explicit rule exception is that creatures can assist if they are not next to the creature making the attack, but as long as they are next to the target.

Every single card follows all the rules unless the card states all or part of a rule that it breaks. In that case it only breaks exactly what is mentioned on the card.