Where can you find a thunderizer on Pokemon Diamond?

You can't find a Thunderizer in Pokémon Diamond. The Thunderizer is an item introduced in Pokémon Black and White, and it's used to evolve certain Pokémon, like Electivire.

In Pokémon Diamond, you can obtain an Electirizer which is used to evolve Elekid into Electabuzz, and Electabuzz into Electivire.

Here's how you can get an Electirizer:

* Trade: You can trade for an Electirizer with other players.

* Events: Keep an eye out for special events in Pokémon Diamond that might give away an Electirizer.

Remember, you can't obtain a Thunderizer in Pokémon Diamond.