Majority of the rarer tamable pets are information that per normal is exchanged between players in game, as most don't want to give away the good stuff. However I'll post the commonly used pets. Also on another note, Royals are randomly tamable (1 in 1000 chance) so very rare
Greater Dragons - Fel Destard
Cu's - Inside the mushroom cave, Ish - Spirituality
Phoenix - Is located in an area with fire and lava, spawns 1 time a month
Abominable Snowman - Top of a mountain, Ilsh, Spawns 1 time a month
Poison Spider - Undisclosed
Werewolf - Werewolf event, on the 1st of every month