How do you get to Canacalve city in Pokemon diamond?

There is no "Canacalve" city in Pokemon Diamond. It's likely you're thinking of Canalave City, which is a key location in the game.

Here's how to get to Canalave City:

1. Complete the "Valley Windworks" gym challenge: You need to defeat the Gym Leader, Byron, at the Valley Windworks gym in Oreburgh City. This unlocks access to Route 210.

2. Travel through Route 210: You'll need to travel west through this route, which is primarily a mountain path.

3. Cross the "Lake Acuity" bridge: This bridge will take you to the other side of the lake and lead you to Canalave City.

Important Note: You'll need to have a Pokemon that knows the "Cut" move to clear a path on Route 210. You can learn this move from the Move Tutor in Oreburgh City.