By 'wear', I assume you mean 'where', and by 'Tallow', I assume you mean Tailow. Tailow is impossible to CATCH wild in either Diamond OR Pearl. But, East of Pastoria, using poke-radar, you can catch a wild Swellow (http://pokemon.marriland.com/diamond_pearl/pokedex/swellow). If you want a Tailow in particular, you can always catch a Ditto (http://pokemon.marriland.com/diamond_pearl/pokedex/ditto) and put them both into the daycare in Solaceon. After a while, on the Day-care app (If you dont have it, there is a man sitting inside the day-care who gives it to you), an egg will appear. If this happens, fly to Solaceon and talk to the Old Man just OUTSIDE the day-care, and he will give you a little baby Tailow egg.
you have to import them from a gba game....
Poochyena (sometimes wrongly spelled as Poocheanna) is a dark type of Pokemon. You can get one in Pokemon Diamond by breeding a Mightyena.
You can find Pidey in a Pokemon Outbreak in Pokemon Diamond
where do i find a totodile in Pokemon diamond/pearl on nintendods
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.
To get a Manaphy in Pokemon Diamond you have to get Pokemon ranger and defeat it and you have to trade it to Pokemon Diamond,Platinum or Pearl.
its not a Pokemon
Not really that rare... in Pokemon Diamond you can find Sunkerns on Route 204
you have to catch all of the pokemon in diamond or SEE all of the pokemon
you can find legendary Pokemon by using your Pokemon tracker
You can't find Steven Stone in Diamond