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.