Airbender

Hello everyone, nice to meet you guys. I created my account months ago but I did not have time to try PRO. Today, I just download it and start to learn how to play. However, when I read about membership and coin-shop, I am quite confused. I would like to know if I can catch all pokemon from all regions (except legendary and mythical pokes) in maps without owning Membership? Thank you for your time.