The special battle rules for season 5 have been revealed! Season 5 will run from 07/18/2017 12:00 AM - 09/11/2017 11:59 PM UTC, and uses the Inverse Battle rules. This means that the type matchup chart is reversed! Moves that would normally be Super-effective are now Not Very Effective, and moves that would normally be Not Very Effective are now Super-effective! This lets some interesting Pokemon that are usually let down by their poor defensive typing really shine!
All other rules are identical to standard Battle Spot Singles!
Official format page on the PGL can be found here.