Honestly and sorry about that, but blissey has been a shit. It on past was too much good, but now it has been a waste of time. Even tuff and fable has been better than her.
She should be a kind of "exclusive" heal pkm, not saying about a normal/heal machine, but something really exclusive. Now i'm at my work and i can't check her current movesets to post here, but i'd really like to suggest you something.
Double Slap
Play Rough
Great Love
Recover
Egg Rain <- I don't remember if this is the correct name.
Heal Bell or Safeguard
Sing
Strenght
Healling Wish <- makes it to heal pkms itself again.
Metronome
Or
Double Slap
Play Rough
Great Love
Recover
Egg Rain
Helping hand
Sing
Strenght
Healling wish
Metronome
Hi obre, Blissey is currently having a rebalance problem because somehow his cds are too short for hiting 3.1k with a move of distance every 15s, it currently can defeat some fighting and rock type so i cant imagine how it would be with your suggestion, it will just have no way to be defeated.