I'm not sure about the team overall but it looks fun. The main thing I'd like to point is out that Blissey is pretty much outclassed by Eviolite Chansey, the only upside of using Blissey is you can have leftovers. If you want to stick to Blissey you're much better off putting 252 in Defense and 252 in HP with a Bold nature, this basically means you will actually be able to take hits from most physical attackers that arn't banded or super effective.
The other option of using Chansey is much more effective at taking hits on both special and defensive sides.
Chansey (F) @ Eviolite
Trait: Natural Cure
EVs: 4 HP / 252 Def / 252 SDef
Bold Nature (+Def, -Atk)
- Wish
- Toxic
- Softboiled
- Seismic Toss
This is the Chansey set I used to great success when I battled competetively, she takes special hits all day whilst being able to recover all the HP back instantly, stops choice specs users in their tracks, unless they're using Psyshock in which case you will be able to take the hit but not anywhere near as well. Now with Eviolite buffing also the defense on top of max EV's and a Bold nature she becomes very resilient towards Pokemon that would usually destroy Blissey. For example: 252 Atk Choice Band Scizor (+Atk) Superpower vs 252 HP/252 Def Eviolite Chansey (+Def) : 80.97% - 95.45% 2 hits to KO. Toxic is used for stalling out special threats or walls which arn't able to touch you, you'll probably be hated for this because Chansey seems to make people angry. Also being able to pass a huge Wish to an ally when need be is fantastic. There are a few other ways to use Chansey but this is my personal favourite.