new EncounterStatic { Species = 593, Level = 40, Location = 71, Ability = 4, Version = GameVersion.B2, Gender = 0,}, // HA Jellicent @ Undella Bay Mon Only
new EncounterStatic { Species = 593, Level = 40, Location = 71, Ability = 4, Version = GameVersion.W2, Gender = 1,}, // HA Jellicent @ Undella Bay Thurs Only
Needs to have its hidden ability if it's the static encounter. However... there is a wild encounter with the same level. Boooooo.
PKHeX finds a best-match by checking moves & evolutions, with the assumption that all other details should be compatible with this best-match. This is the only case known where two different encounter types share all details except for the ability ?