[quote name='io']I forget what's there exactly, but if there's one to increase the familiar catching rate I would recommend that if you plan to go for the platinum. The one that costs 8 stamps and gives Oliver an extra 100 health and MP is useful, though you are leveled up pretty good already. More just makes it easier (or rather that you don't have to mess with MP items as much during boss battles - which is nice). I'm pretty sure the one I put off till last was the one that regenerates health while walking. That just seems pointless since there are so many health regen stones and spells you can use (not to mention food).[/QUOTE]
The way I understood it, is the +% to catch familiar wasn't a set 12% or 15% increase, but more of a 15% of the original. So a 10% catch rate is bumped up to 12%, for example. Really doesn't help that some are as low as 4% to begin with. I went for 1st form, and leveled them up (fast) with Toko's.
For stamp progression, in the 3rd row I'd recommend, last stamp option 1st or 2nd, his potential with more MP is nice for spamming spells/tricks. Next scare enemies to drop items. Walk to increase HP is worthless (as it's 2/3mp per heal spell, cheaper than full heal one) so get that last. Trick/Spell MP cost down is fairly good, it's a toss up to get that one 3rd/4th before or after Familiar catch rate. The sucky thing is, you'll be missing quite a few stamp rewards until post game content. At least for me since I picked 8 stamp option 1st, costs a lot.
+HP/MP > Item drop+ > Familiar catch+ > MP cost for all- > Walk heals HP, is what I did.