If you want Screech Rank 2 I recommend getting it from this guy at level 32-34 if you dont you'll have to get it from a Shrink Bat ( In uldaman) at level 37-38 or wait until level 39-40 and get one from a Dread Ripper In Desolace

Info from http://petopia.brashendeavors.net/html/skills/skills_screech.php