yeah i really have underestimated the difficulty too
for diamond the options are to train to lv275 and
>beat nvhilla
>skip nvhilla and beat one between cslime/hlucid/hwill/cgloom
or 270 and
>beat nvhilla and pick two of them
>skip nvhilla and pick three or them
or 265
>beat nvhilla and pick two of them
>skip nvhilla and pick all four of them
but i'm just not feeling the gruesome effort needed really being worth two leg pot scrolls and one not so special looking nx set t b h