I want the XCode Beta Version which is compatible with macOS Catalina, as my MacBook does not support Big Sur and XCode 12.5
XCode Beta Archives
There is no Xcode beta available for Catalina. Just use Xcode 12.4, which you can download from the App Store or from Apple's developer downloads page. If you can't find Apple's developer downloads page, the site Xcode Releases (xcodereleases.com) has Apple's download links for every Xcode version.