By type alone Poison Pokemon are pretty weak. But type means nothing, and I mean nothing. Sure Poison, pokemon are only super effective against Grass, and bad against other Poison, Ground, and Steel, and Psychic, but almost any Pokemon can be used very efficiently.
I use Muk alot, with its Attack reaching past 300, Hp over 400, and Special Df past 280, it can last a long time in battle.
Sludge Bomb, and Haze are its Key attacks. With flamethrower just in case(even though its really weak on anything but a steel pokemon) and a 4th attack of any choice. Being poisoned or badly poised is so under rated with non "advanced pokemon players" its not even funny. Throw in left overs, and Muk will be in battle against special types for a long time. And don't even think your double teams, Calm minds, swords dances, and batton passes can save you. Thats what Haze is for, one of the greatest dusruptors in the game.
Weezing, can now levitate, so now only Psychic pokemon are super effective against it. Great defense, good attack, and much better special than muk. A fire attack, sludge bomb, and Haze will work wonders, but Weezing is alittle more versitle, you can do all kinds of things with it.
NidoKing and NidoQueen, both can learn Mega Horn, They can be powerhouses of physical attacks. Earthquake, Sludgebomb, and MegaHorn are all that is needed. Knock out a Mewtwo in a single hit, send them out against an electric pokemon, and big psychic is likely to be switched out or grass, anticipate that by using a Meghorn and your good to go. And they arent weakend to grass, poison cancels that out to make it just a normal effect. But they are weak to water, ice, psychic, and ground.
I could go on, but never doubt the poison pokemon!
Any way, having 16 people together will allow you to exchange records I know that for sure, but thats pretty standard and boring.
I think we all know this but im not sure.
-The day and night feature will return, with afternoon and morning also.
-The new region is called Shinou.
-Voice chat over wifi connection.
-Male a Femal pokemon have different sprites, example; a female wooper's antenna is alot smaller.
-no new types, just new combinations, even a pure flying type
thats all I remember.
Check
www.serebii.net for more details