How to kill a Blissey?

Exeggutor

I think Blissey nerf is inevitable. Just a matter of how long it takes them to do it.

Something with high attack, like Alakazam, Machamp or Arcanine. If time is the problem, its better not to dodge.

I fought an 2400 cp Blissey with my 1850-ish Machamp (counter/close combat)
I came very close to winning and would have won (with only a bit of hp remaining though) if I hadn't missed the last hyperbeam. I didn't dodge most of the quickmoves.

So, in my experience, Blissey seems beatable with Machamp, but he will only be able to defeat 1.

I find it helps to build a charge up during the previous battle, if possible. Gyarados with Bite / Hydropump does okay as long as the CP is significantly higher.

Machamp

Psychic Pokémon with a strong base ATK.

I'm not sure if I like/dislike Blissey personally...

I understand the frustration for folks, but making everything handed on a plate and SO easy for everyone is dumb too...I think some trainers were upset a level 39 Mon can be beat by a level 25 trainer so I suppose the question to ask is where should the line be drawn?

Blissey can be beat. Definitely with 2 trainers very very easily...

Solo, the ones who can do it fairly easily are higher attacking, quick energy charging decent charged move mons...

Machamp, Gengar, Alakazam, Dragonite, Ursaring can all beat Blissey fairly easily/consistently with the right movesets. You need the NEW moves on Machamp and Gengar though, but even if they get knocked out, you can put enough hurt on Blissey that you can have another mon clean up after with the spare 20-30 seconds...

Making her a walk in the park would be bad for the game IMO and it's only been 3 days since gen 2 release?

fighting blissey all you need is attack.
check
https://pokemongo.gamepress.gg/pokemon-list-advanced
sort the list showing the pokemon with the highest
attack-stats and i'm almost sure you will find a better
candidate for the job in your arsenal

I would recommend fast quick moves with quick charge coupled with a hard hitting charge.

Bite + Fireblast on archanine... Bite + Hydro pump on gyrados....PSY/ZH + Solar beam on exeggutor might work too... (provided they are high enough CP)

So far, my arcanine, golem, vaporeon, scizor, muk, rhydon, gyarados etc are doing fine, but that is taking for taking other gyms, prestiging on the other hand is f***ed tho.

Machamp is the new meta-defining attacker. Beats out DB-DC Dragonite against Blissey and Snorlax, double super-effective into Tyranitar, etc.

I was able to beat a 2700+ Blissey with a Vaporeon with 2850 CP. I had about 5-7 seconds to spare. You can only dodge opening 2 hits (try to get in one of your own first) and then all the charge hits. Blissey also can have Psychic moves which put fighting types and gengar at a disadvantage (as you will take extra damage). Actually my new Espeon (CP 2345, Confusion, Future Sight) came really close to beating it. You get the added bonus of taking .80 damage from psychic moves. Right now, the psychic moves seem to give you the biggest bang for the buck. A Rhydon or Golem with Mud Slap and Stone Edge will do well (high DPS moves make the difference here). The only other way is to team up with anyone from your team.

I have a 2895 Blissey and with my current mons available (not in gyms) I can't beat it. Get close but always time out. If one of my mons faints if I miss a dodge of HB (only dodge the charge move) I time out for sure. Wastes too much time switching mons.

I tried to prestige a 2800+ blissey today, missed by a couple seconds, but I was close enough to believe it is very doable, solo. I think flareon with overheat puts out damage at a fast enough rate. I should have used my c/dp machamp rather than my kc/submission one. eggs with solar beam seem fast enough, alakazam and dragonite work, too. I think espeon would with farsight.

I just spam attacked. I'd already gotten through my own 2400+ CP blissey.

Anyway, I think anything with high base attack stats and an OP charge attack should work, just be prepared to dig into your revive bag. I'm not sure if there is a cooldown for mons feinting. If there is, I should probably dodge some, but what I did worked well for testing a few mon against blissey.

I just beat a 3000cp Blissey (i am level 35 and the guy with the Blissey was level 35, and my 91IV Blissey is maxed at less than 3000, so it was a 95%+ Blissey)

I used 2 Dragonites (both over 3000cp and one with DB/DC and one DB/HB) and just spammed DB and charges moves as much as possible. I only dodged the Dazzling Gleam, and not even all the Gleams for the 2nd Dragonite. It wasn't ideal because thw SE damage from Gleam, but I got the job done.

Heracross with a fighting moveset crushes a blissey.
Easy to take easier to up.