QR that takes up for Secret Shore: i.imgur.com/sXqmCUo.jpg
QR that takes up Secret Meadow: i.imgur.com/aF02xUQ.jpg
Make sure their bases stay on your favorites, and that there are no other Bases with the 2 areas. Also make note that you have to wait until Midnight for the bases to be active when initially scanned. Chaning the time/3DS (even with the "one minute to midnight" trick) will result in you having to wait 42 hours instead!
Very helpful if you're trying to get your Pokemon to level 100 ASAP. Basically, these 3 level 100 Blissey can't hurt you (they only have Healing Wish) and hold Toxic Orb, which they will KO themselves with. What only makes this better is that they're all Triple Battles, so you can power level up to 3 Pokemon per trainer. There are a total of 12 trainers a day with nothing but lv 100 Blisseys.
While holding Lucky Egg and using the level 3 Exp O-Power, you earn so much that even at late levels, you get 2-3 level ups per singular Blissey. In addition, there a neat little trick to battle them twice a day for a total of 24 battles per day. You can battle them once in their base, and once at your base. It works both ways, so you can fight them in your base first, then at theirs, or vice versa.
I just tried this and got my Azumarill to level 100 with a few hours after EV training it and training it half way to 50 with Blisseys.
So go power level in Bliss!