[moi]

Originally Posted by Fat Fabbles

Out of all of those Pokemon, the only one that is absolutely guaranteed a free switch in BU Dialga. Every single one of those pokes are afraid of either Thunder Wave or Toxic. And if Blissey does not have one of those, it means it is most likely Calm Mind, which beats: Giratina, Jirachi, Kyogre, Lati@s, Lugia, and non Taunt Mewtwo. Blissey does a fine job as a simple supporter as well, getting SR and Aromatherapy.

Lately, it seems that Deoxys-F is being used more either as a Starter to scare away most versions of Kyogre and Darkrai or as a late game cleaner in place of Rayquaza.

Well, there are a few things that can switch in. Kyogre with Calm Mind outstalls Blissey as it sets up if Blissey doesn't have Calm Mind (9/10 times). Without Wish, Blissey can't stall out Groudon with Toxic, and itself fears Toxic and Earthquake from Groudon.