I'll tell you this from my experience. When Metalkid's calculator comes back up I'll confirm them.
1. I can substitute after a Garchomp Earthquake, Fire Blast, Fire Fang, or Draco Meteor. Set up your sub, or blizzard them to death. I'll have to check Outrage on a damage calculator... as no one seems to want to lock Garchomp into an Outrage vs a hail team.
2. Walrein survives a Specsmence Draco Meteor... not by much. But enough to Blizzard him on that turn.
3. Flare Blitz from Infernape is weak. Close Combat on the other hand dishes out some serious damage.
4. I've survived Scarf Heracross Stone Edges and Megahorns, but never a Close Combat :-(
5. 104 subs means Blissey does not break the subs.
6. I've barely survived a Magnezone Thunderbolt just once.