Blissey doesn't really stay in to fight... like ever... neither does skarmory really. They usually just come in to absorb the attack and (hbell/wwind). They may give off one attack or two, but they are not gonna stay in to fight, especially against the likes of tyranitar or electabuzz. And on that note, let's remember that while skarmory/blissey may play a huge part in their team (stalling... yay...), there are 4 other pokemon that they can switch to, and likely those pokemon will be there to cover whatever skarmory/blissey can't.

Also, Zapdos is one lame-*** blissey counter; it's usually blissey wins that war.

And yes, fire blast on lax covers it's weaknesses nicely, but then it'll be missing a quake/curse/rest, which some might argue would knock it down a peg in the usefulness scale.

Hmm... if your special attacker can handle blissey's attacks, there shouldn't really be any problem with blissey. Especially if you have ice beam... people usually freak out at the first sight of it touching blissey and cringe at the thought of their precious belling pokemon getting frozen (unless it's a water pokemon and blissey has bolt).

How I beat Blissey and Skarmory: I have nobody on my team they can switch in against... blissey's easy, because all my pokemon could blow up in it's face at any time, and the majority of them are physical attackers (muk/lax/steelix), or inflict status ailments (cloyster's ice beam/eggy's sleep powder/gengar's ice punch). And skarmory couldn't touch muk/lax with their fire blasts, cloyster with his naturally skarmory eating ability, gengar with his krazy tbolt, eggy with his sleep powder (well, maybe eggy, but not like skarmory is gonna make any of my pokemon flinch...) or steelix (though steelix can't hit skarmory, skarmory can't do squat to him and steelix can roar better than skarmory can whirlwind: and with spikes out and a curse up, there'll be a lotta roar/spikes damage going around if skarmory keeps showing up to try and stop steelix.

Right, give things fblast, tis the usual anti-skarmory move for physical attackers.