Can't find certain sealstone

Answer from: Mitty
Hare of Inaba Orange Sealstone is in Increasing Strageness Part. :)

Answer from: Sumner072
You can also battle for sealstones. I've noticed it's easy to gather the first 4 sealstones in the story, then battling for the 5th seal stone isn't bad but the 6th one is usually held by significantly higher leveled players.

Answer from: AOI SAKURA
Usually you will not have all sealstones come out of story because there will be a new sealstone as the story goes on, and yes higher lvl players will have the rest of the other sealstones you might be searching for you can either use charms to protect the current sealstone or wait for they're deff to get low enough to battle for it or wait until you lvl up high enough to where it's easy to come by. NOTE: each battle will take 80-100 % of your attack spirit so you will have to wait till you're spirit is high again to attack, but this also gives the opportunity for someone else to steal your stone. Also you can recollect the same sealstones to get the special Magatama stone for that demon to increase in lvl and skill after each recollection you will only get magatamas not sure if you will get a deamon itself once it has been fuse?

Answer from: Lady War
You will only ever gain 4 of 6 necessary from Story mode. You must battle for the 2 remaining colours.The rarity of sealstones generally goes Yellow, Orange, Green, Blue, Red and finally Purple.Less people gain Purple stones and so they have a greater demand. I suggest if you find it difficult to keep hold of the purple seals to get that one last. As soon as you have all six the card will automatically be summoned. You can repeatedly complete the hare if inaba for mags which will level the card up along with its skill. If you can't find anyone with purple stones just keep refreshing. Some lower levels will appear eventually.