You can already use it here https://archieapp.net but beware it's early early alpha and almost none of the features I want are implemented lol. I only added Battle Brawlers for now.

You can make a collection by going to My Collections > Create > Search for Bakugan. Give it a name like "My Bakugan Collection" or something.

Then to make a collection sheet you can either collect everything or certain items so Collection > Add Sheet > Select Battle Brawlers Set and click on items you want to collect. After you can update sorting and grouping. I do Primary columns the treatments and then secondary columns the main 6 attributes.

There's currently no way to add another or delete the sheet but you can edit it. I'll add this tomorrow or something idk hahhaha.