There's only one legendary you can get on route 209. Spiritomb. You can get it by first putting the odd keystone into the broken tower. then greeting 32 separate friends in the underground (not the guys selling stuff) then going back to that broken tower and there's Spiritomb.
evolve it from pupitar which you need to evolve from larvitar which is a pokeradar Pokemon on route 207
Catch an Ariados on route 229 (at night only) and breed it
you have to catch dialga on spear piller first
First to catch the Pokemon Buizel (diamond/pearl) be in floroma town. Next walk to route 205 (use map). That's where buizel is found.
You can get a tyrogue in Pokemon Pearl and Diamond after you get the national Dex and the radar thing. Then go to route 208 or 211 and use the radar. They're rare, and it took me 15 minutes to catch one.
You can catch Scythed on route 229.
No.
on route your mom
On route 224 with the pokéradar.
grimer is in route 212
Route 209 and in the southern part of Route 210.
You can catch Lanturn in Pokémon Diamond and Pearl by Fishing with the Super Rod in Route 220.
Route 214 and Lake Valor
Route 226 with the Good Rod.
In route 222. How: Use pokeradar.
Route 216 with the Poke Radar
Swarm. Route 230 in the grass.