You can't access Route 224 until professor Oak upgrades your Pokemon. Then go east of Victory Road. Route 224 is the eastmost Route in Diamond Pearl and Platinum.
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Route 224 Poke Radar
route 224 is where you get shaymin.but, you can not get shaymin until you get oak's letter by wireless connection,from a friend, or by action replay code, oak's letter.
get the wi-fi gift oak's letter then head over to route 224!
Pokeradar on Route 224. It's easier just to catch Duskull in the Lost Tower at Night in Platinum. (Duskull don't appear there in D/P, only Platinum.)
One of the trainers on route 224 has a Drowsee (a psychic on the way to the berry patch. Can't get to it without fighting her.)
lapras
You can get him/her on route 224
First, go to the Pokemon Leauge.Then, right above the Pokemon League is route 224
You can find them if you fish in route 224.
route 224
route 224. {flower paridise}
the flower paradise on route 224
route 224 affter getting the nasinal pokedex
Route 222 or 224.
They swarm occasionally on route 224
Route 224 Poke Radar
with the oak's letter event, you can catch shaymin.