by catch hippodon is and somewhere in sand it dig in sand and you need the Pokemon who have 3 faces
In the Hippowdon Temple.
When you're in Haruba Village you go up from the town and keep going up there will be a vine you need to cut, climb up there and it'll take you to the temple.
First get all other 266 Pokemon in the Browser then you will get a mission to go to hippodon temple. Catch the 3 Regis then go down a hole in the temple put the three regis on these things then you vs Regigigas
you get the rest of the Pokemon and go to where the sliding floor is... the go to the very middle in the quicksand.. you need all the regis with you to open the door
catch regice regirock and registeel than go to the hippodon temple and go through the suspicious hole in the springy grass room
You have to capture the Hippowdon. This may be challenging, since you go slower on the dark sand and the gusts of wind cause damage, but capturing Doduo will make it easier.
Espeon is the bottom room in the room with all the arrows that take u to another part of the room in hippodon temple.
in the hippodon tempel.
After capturing regirock, regice and registeel, go to the 3rd floor of the ranger base, talk to Chairperson Erma, and then visit Hippodon Temple. Go to the room where you captured starly, stand on the sand vortex, and then place the regi's on the corresponding pedestals. Finally, go through the door and see regigigias. Ta-dah!
There are alot, these are the ones I know of : Gengar, Gardevoir, Dusclops, Dusknoir and Mismagius!
If you want to get a Hippodon first see it on your Pokedex and have at least 1 Sinnoh GYM Badge and put a Pokemon up for a trade in the GTS. And hopefully some body will trade you for it.
Go to route 228 and search the grass then you will eventually find one to catch,or you could trade in gts. pictures of my favroite pokemon! oh and I LOVE POKEMON!!!!!!!!!!