When you first find it it runs away if you look on your poketch map it shows a weird monster face that is mesprit go to a route and hope it appears there then run into a battle it will appear! Weaken it then find it again and use a quick ball hopefully you will capture it.
they are mespirt, azelf, uxie, and dialga
Use the marking map to track her down.
You can find mespirt in : Dimond Pearl Platinum HeartGold Soulsilver Black 2 White 2 Pokemon Mysterdungeon Darkness/Time/ Sky (Maybe the new Mystery dungeon) (You may be able to catch mespirt in the new games, Pokemon X and Y)
luck
You can find Pidey in a Pokemon Outbreak in Pokemon Diamond
first you need to go trade and see if u can trade a Pokemon for another the other 1 u get could have a master ball from your friendperiod I'm thirteen thank you
Giratina from the disortion world, Azlef, Uxie, and Mespirt from their lakes (Mespirt starts roaming after you talk to it) and Dialga and Palkia at Spear Pillar (you need their respective orbs, you find them in a previously inaccesable area in Mt. Cornet) Darkri shamin crestela and hetran
where do i find a totodile in Pokemon diamond/pearl on nintendods
i would be glad to help.first go to jublife city.go to the guy who owns the poke app compony.then talk to him.he will give you a new poke app. there will be a face.it will tell you where mespirt is all the time but she might move.you should use a master ball she is hard to cathch
well the most rarest pokemon i would say is unixe azelf and mespirt they suck i know but there the rarest in the game and dialga and girantina are rare to but not as rare as mespirt, azelf and unixe.
You can not find or get manaphy on Pokemon diamond but you can by hacking, trading or... if you have Pokemon ranger you have to complete the manaphy mission and then you can put it onto diamond.
You can't find a Ho-ho in Pokemon Diamond. You have to migrate.