You have to obtain the national pokedex (beat elite 4 and go to the lab of prof.)
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.
Route 225 (the route north of the battle area)
You can find it on route 225 and route 226 after you obtained the National Dex...
Complete the pokedex.
complete the pokedex !
North from the fight area, or south from the Survival Area.
you can catch fearow in route 225, 226, 227 and stark mountain
In Pokemon Diamond, Dawn Stone can be found on Route 225 and on Mount Coronet. It will help Kiralia and Snorunt evolve.
You can find it in-- mt cornet. route 225 pick up abilit
Lax incense is a breeding item in Pokémon Diamond. It can be found somewhere on route 225. It is needed to get Munchlax.
To get Makuhita in Pokemon Diamond you first need the National Pokedex. After getting the National Pokedex talk to your rival's sister in Sandgem Town. She will let you know what Pokemon swarm is active for the day. Check with her everyday until she says Makuhita are active on route 225. Now simply go to Route 225 and catch yourself one.
Just to tell you their is no route 426 in Pokemon Diamond.