Weezing can be found in Route 227 and Stark Mountain on Pokemon Pearl. Weezing isn't rare in the two locations it appears in.
With a Pokemon Emerald Cartridge in your GBA Slot, Shuckle appears at Route 224.
It appears as a Swarm pokemon in Route 225. See Related Link for details.
Route 208 and 210, but only appears if you have Pokemon Ruby in your GBA slot.
Feebas appears when fishing with an old rod in route 119 (extreme rare to the max but I got him in pearl).
Route 241 does not exist in Pokemon Pearl it only goes upto Route 230
You can obtain Swinub from the swarm in Route 217 in Pokemon Pearl.
You can get a Seel in Pokemon Pearl by finding it in the water on route 226.
Catching Minun is relatively easy though finding it might take a bit of time. Minun can be found in the Trophy Garden of Pokemon Diamond and Pearl. It also appears as a swarm on Route 6 on Pokemon White. And finally Minun appears on Route 5 of Pokemon X and Y.
all the Pokemon on route 210 in Pokemon diamond and pearl are ponyta, geodude and if your really lucky you can find onix.
Route 114 doesn't exist in Pokemon Pearl, however, there is a Route 214, which is in between Veilstone City and the Hotel Grand Lake.
Route 225 is not a route that can be found in Pokemon Firered, route 225 is in Pokemon Diamond, Pearl, and Platinum. To get there is Diamond Pearl and Platinum, you have to see every Pokemon in Sinnoh, then talk to Prof. Rowan and get the national dex.