Xcode 3.2.2 Release was released on 29 Mar 2010 and requires macOS 10.6.2+.
It can be downloaded from https://download.developer.apple.com/Developer_Tools/xcode_3.2.2_developer_tools_beta_20728/xcode322_2148_developerdvd.dmg.
Release notes are located at https://download.developer.apple.com/Developer_Tools/xcode_3.2.2_developer_tools_beta_20728/about_xcode_3.2.2.pdf.
The SDKs it contains are:
- iOS 3.2