>>4108245401) Yes
02) Trading (No GTS) and battling is all there is for online features as far as I heard (oh and if you want to do co-op raids I guess???). There will be raid events that will up how often they appear or wahtever, but that might work for people who don't have a subscription. Honestly, it's probably not worth the $20 a year unless you have other games that use online
03) The old ones still require trades that had it before, (Machoke, Onix with metal coat, etc.). I don't see any new ones in Kaphotic's dump.
04) Probably within the next few days. Sun/Ultra Sun took a couple days after Moon/Ultra Moon IIRC. It's already been datamined though.