Originally Posted by
Daetur
Try the Cross Realm Assist addon- it'll let you join groups that are forming that have auto-invite set. If you're just going to be hopping from realm to realm looking for a rare spawn, you can usually join, for example, a Kazzak raid, or the group of a helpful person offering their Garrison buildings to others, and then leave in a minute or two when you're done. The people in most groups you can use for realm hopping won't even be in the same zone, so it's unlikely you'll have competition for the pet.