relms sketch thing is hard to do....yeah i tried it haha
have gau and relm in your party get gau to leap and when he comes back sketch him
alot easier apparently
OR
you can sketch a vanished monster
and it can either go good or bad =\
Good: lots of items
Bad: lose your game save
never tried cyan thing iv seen it a couple of times tho its gooood
make him use sword tech retort cast imp on him and kill him, revive him and he goes insane...atleast i think thats how u do both of them
there the only ones i know

and i wouldnt advise doing to relm sketch one lol