Use these, each QR is for a different secret base all with 3 lvl 100 blisseys.
(note all of these are either at the secret meadow or secret shore)
To use the codes go into YOUR base and go into "manage QR code patterns".
You need to wait until midnight to actually use the bases, so don't try to battle them immediately.
After you've waited for the time to pass, go into each secret base and hit the level release (the machine that lights up with pretty, pretty colours). This changes the blisseys to become lvl 100. You need to do this in every base.
For maximum EXP, after defeating each trainer in their base, invite them to be a buddy in your base- which lets you fight them again. But make sure to send them away afterwards so you can re-invite them the next day.
Also, set the battle to triple, makes the battle faster.
If you do this you can verse 24 blissey trainers a day, which is 72 blisseys.
If you're pokemon is internationally traded, holding a lucky egg and you're using MAX EXP power a single kill yields something like 55k EXP which can be around 4 million exp a day after killing all 72.
Idk if someone's gone through this already but i hope it helps.