How do you get to the snowy environment in Pokemon platinum?

In Pokémon Platinum, you can access the snowy environment known as Route 217 by first reaching Snowpoint City. To get there, travel north from Veilstone City, passing through Route 216, where you'll encounter snowy weather and trainers. Once you reach Route 217, you'll experience the snowy terrain where various Ice-type Pokémon can be found. Additionally, you can explore the area to find items and hidden paths.