I agree. One requires both Bikes and therefore requires full game completion. Then there's the remade Safari Zone, which is VERY well done, but is equally annoying because you need one Bike for some areas, the other for others, and - in one case - BOTH for the one TM there. In AS, I'm not bothering visiting other than the quick visit to hunt for a Pikachu, where a Lv.40 one with Thunder Punch graced me with its presence (and was subsequently caught). I caught one before that, as well, so I use both in assisting to train my team up to higher levels during water training against Pelippers. I might return for a Girafarig.
I also read about the Blissey bit. If you have even a Lv.2 Exp Power O-Power, you can get something like 35,000+ HP battling just one Blissey in a Secret Base (at Lv.100). What makes it funny is that you don't even have to do anything for the first two on the team because they use Healing Wish, which is a suicide move that heals the incoming party member. You just have to KO the third, and by then, you better be at least Lv.50 from all the XP gained. {XD}