Step 1: Find out that Spruce used his badge to return to the guild, and use your own badge to return to Arnold's guild.
Step 2: Ask around Arnold's guild to see if anyone has seen me (they have, I wasn't being secret... in fact, a certain Bidoof knows that I headed off to Wally's guild)
Step 3: Head off to Wally's guild, and ask around for a grey snivy (They should know where I went... so, no prob)