Under lag conditions, healing moves try to heal the oponent.
For example, in a server my Pidgeot tries to Roost the opponent.

Can you confirm that this is only during "lag conditions"? Does it occur with other healing moves besides Roost?

I wasn't able to test with other healing moves, but I heard it also happened with Synthesis.
I heard of that long ago, but the day I posted this ticket was because, in InitiaNova, one of the pixelmon servers, I pretty much only play with my pidgeot, because it's my most stable pixelmon in the server. One of the moves it has to make sure it will survive, is roost.
For some reason I still don't understand, my computer has been suffering lag problems with pixelmon, specially when playing online, in that and other servers. Then, one day in that server, they made a new Safari zone with a lot of pixelmon. I went straight to check it out, and to fight some bosses, but the ammount of wild pixelmon, players, made me lag even more. When I was about to kill a pixelmon, if I tried to use roost, I healed the opponents, geodude, machop, snorunt, illumise, sableye, instead of pidgeot, and I also suffered their attack instead.
This never happens when I'm not laggy.

This ticket is expired. If you believe it is still an issue, please make a new ticket.