I don't know if this has happened to someone else,
In my team I've got a Rampardos with Earthquake, and a Gengar, obviously with the levitate ability(both of them 100% legit) well on my DS SoulSilver game I use both for doublebattles and the Earthquake-Levitate combo works but when I try to use it at PBR the Earthquake always ends up hitting my Gengar fot supereffective damage!, this only happens at Double battles where Gengar is on my side, I proved it with a flying type and then it works, but I would like to know why Gengar is affected, I double checked Gengar's item (Focus Sash) and the opponent Pokemon had never used Gravity or anything like that so I would like to know if there is a solution...