i trained mine at mt.cornet
route 205 for Pokemon diamond, pearl and platinum. the trainers have Pokemon from level 10 to level 17
elite 4
Route 201 or 202 or 203
Anywhere that u find Pokemon that are close to the shromishes level.
the place where you can breed Pokemon next to heart-home city, that's where i go
There is no place where you can catch a level 100 pokemon unless you use some cheat device. (Such as an action replay)
Stark mountain battle about 7 Pokemon then it will be level 73.
iron island or upper level mt coronet
in pearl, you could catch shinx and luxio behind this building close to that flower garden with one house and a tree.you have to use surf in the river-like place in that flower city/town.
I am sorry to tell you, but there is no such place as Springfield in Pokemon Diamond or Pearl. Perhaps you are confusing it with the name of another place.
You need to catch one first. Then after you catch one, go to the daycare in Johto, and put the Shinx in the daycare. Then put a ditto in with it. They should have an egg. Depending what gender your Shinx is, put the opposite gender in with it. It can be any Pokemon not just a Shinx
No, Amity Square is the only place in Pokemon Diamond, Pearl, and Platinum where you can stroll with Pokemon.