To get in a raid gym your going to need a pass. Which can be easy obtain by buying it from the shop or getting it at a gym.if you guys did not know going can now get items from fellow gyms. All you have to do is click on the right bottom button and spin the middle icon. And items will be giving to you long with a badge. You can also receive a raid gym pass the same way but the catch is you only get one from the gyms onces a day. Also you can only used it if there is a raid battle going on.
Onces I find out how to use the pass. Ill let you know. Or if you know and would like to share that cool too.