And as for the metagame, only 1st stage pokemon are allowed, with the given requirement that if you use a pokemon it must have one or multiple evolutions (ie no skarmory, heracross, etc in LC). Since LC is played at Lv5 instead of Lv100, the items commonly held are different from OU/UU/NU play. Oran berries are staples, as at Lv5 10 HP is often half of a pokemon's total HP. Leftovers see less use than higher level play, because almost always you will only be gaining only 1 HP per turn. In LC, Life Orb gives roughly the same boost as a choice item, so it is used often :)
Other than held items, the EVing system, and the level played at, it's much the same as higher leveled play, except with the nonexistance of stall :/