I've always loved the displacer beast (probably could start this thread for the illithid, too, and might someday later), and I think they'll be a blast at my table. I've seen a number of takes on converting it to Pathfinder rules, but honestly/frankly/shamefully I'm not all that intuitive about these things, I never convert at all, and I'm hesitant to do something that'll be unfair to my players or otherwise waste their time. I pretty much stick to Paizo materials, with simple templates being about as fancy as I get with monster builds, so this is kind of new territory for me.
So per the title! Is there a conversion of the displacer beast floating around that you'd recommend? Or do you have a conversion you use? Is it time to start learning to build my own from scratch, and if so of what pitfalls should I be aware and for what general CR should I be aiming? I've got Monster Manuals for 2nd, 3rd, 3.5thrdst, and 5e to reference, for whatever that's worth.
Thanks very much, in advance, for your thoughts and advice.
KIS: Just use the 3.5 version, redo the skills and add feats as required for their HD (you will need to add 1).
stealth +14, perception +11, sense motive +3
alertness, dodge, improved initiative.
There isn't any incompatibility issues. You could take a closer look at magical beast and see if there are any significant differences. A brief look and reflex save might need to go up to +6. I haven't taken it apart though.
It's third party, but Super Genius Games put out the missing template, which is basically a "displacer" template with the serial numbers filed off. They used that particular template name in order to make a displacer beast near-clone (no tentacles, only four legs) with a terrible pun for a name, the Mising Lynx.