Hi there. There are quite a few and they are fun to collect. Here are a couple of posts that may help you out
www.elitefourum.com/t/english-promo-sub-set-topps-and-non-tcg-checklist/12949/1
www.elitefourum.com/t/updated-6-15-15-alternate-set-card-checklist-english/11788/1
Here is the link from bulba Bulbap