Where to get frosglass on Pokemon pearl?

You can't get Froslass in Pokémon Pearl. Froslass is a Pokémon introduced in Generation IV, but it's exclusive to Pokémon Diamond.

Here's why:

* Pokémon Diamond and Pearl are separate versions. Each game has unique Pokémon that are not found in the other.

* Froslass is a Diamond-exclusive Pokémon. This means it can only be caught in Pokémon Diamond.

If you want to get Froslass, you would need to play Pokémon Diamond.