Who to walk next?

I would say Blissey. Even if you don't have a Chansey to walk with so you can put your Blissey in gyms, this is still a very worth it investment. And depending on your gym activity, you may not even put a sub 2500 Blissey in gyms anyway (putting a Blissey at the bottom of your own gyms is... a d*** move to your own team, so...).

I rarely walk with anything else than Chansey, Snorlax or Larvitar these days... Last time I walked with an other Pokemon was during the last double XP event, so that I could get that Houndoom evolution during a lucky egg...

Sounds like you probably want to walk Blissey since your other options are nest farmable.

I would probaby make Blissey my buddy.

When you go for Abra, also consider Focus Blast a good evolve...it hits hard into Blissey and Snorlax. It's base hit more than makes up for it's lack of stab, and it is SE into them both.

Blissey. Always Blissey. Or even better: Chansey! ;-)

I would say Blissey. P/DG is a great moveset and in the current meta Blissey is by far the best defender . You could put some other defenders in gyms-until you will evolve your 2. Blissey.

Rhyhorn sounds like the quickest project.

Walk your blissey and just use another I know mind blown there are more than blissey to put in gyms I know its not like I mean there is almost 300 pokemon to choose from and some how we are down to 7 why is this what this game has begun.