Credits
From: http://www.elswordhq.com/forums/index.php?/topic/8399-pet-system-guide/
Courtesy of AShadow
With add-ons and conversion to a wiki-format by Ginseng
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So apparently the 4th evolution of the Pocket Phoru, the one with the red scarf, is actually a separate pet obtained through the event back when pets were first released. The regular Pocket Phoru has only three evolution forms.
Needs Updating
The part with the details is missing info on Hoya, Alice, and Medusa.