What is a Remote Raid Pass in Pokemon GO?
By Jack Cohen

What is a Remote Raid Passes in Pokemon Go? They have been added to Pokemon GO and they make battling and defending gyms just that much easier in this isolated time. You'll have to be able to see the gym on your map in order to be able to join a remote raid, but you won't have to be nearly as close. If you already have a Pokemon defending that gym, you'll be able to remotely participate no matter how far away.
The ability to join any Raid Battle you can see on the Nearby screen or that you can tap on the map is now live for Level 35 Trainers and above! These Trainers can use a Remote Raid Pass to do so. Stay tuned as we continue to gradually roll out this feature to more Trainers.
— Pokémon GO (@PokemonGoApp) April 27, 2020
What is a Remote Raid Pass in Pokemon GO?
The Remote Raid Pass is what will allow you to participate in these raids. They are different from normal raid passes. Currently, you can purchase a set of three passes from the shop for one Coin, but each one after that will cost you 100 Coins, or you can purchase a bundle of three for 250 coins.
You use these Remote Raid Passes just like you normally would, just tap the gym with an ongoing active raid and select the pass. The usual 20 player cap is still in effect. Players needing to use a remote raid pass will do reduced damage in the future, but that is not active just yet.