The whole time

[Talos the Talon!]

So this rogue talent (The Whole Time)allows a rogue to active various invisibility spell scrolls and wands. Treating the spells as if they were on his spell list.

Obviously, that make wand activation a snap. But a scroll? Is this a UMD check? Some other check? What's the DC?

[Bhai]

It allows him to use a scroll as well. Scrolls are spell trigger/spell completion items.

[Derklord]

There're four requirements to cast a scroll:
1) Correct type
2) Spell on class list
3) Must have the requisite ability score
4) Caster level ≥ caster level of the scroll

#1 & #2 are fulfilled by the talent*.
#3 depends on the type of scroll:
Vanish: If it's an arcane scroll, you need int 11 or cha 11. If it's a psychic scroll, you need int 11.
Invisibility: If it's an arcane scroll, you need int 12 or cha 12. If it's a divine scroll, you need wis 12 or cha 12. If it's a psychic scroll, you need int 12 or wis 12 or cha 12.
Greater Invisibility: If it's an arcane scroll, you need int 14 or cha 13. If it's a divine scroll, you need wis 14 or cha 14. If it's a psychic scroll, you need int 14 or wis 14 or cha 13.
#4 is something that the talent doesn't help for, even though I presume that's an oversight. To cast the scroll, you need to make a caster level check (1d20+0 in our case), DC is the scrolls caster level +1.
Theoretically, every scroll needs to be denoted as arcane/divine/psychic, and with the caster level at which it was created, but they never are in practise. In PFS, a bought Scroll of Greater Invisibility is always at caster level 1(Vanish)/3(Invis)/7(Greater Invis). In home games... well, ask your GM. An arcane scroll has a min caster level of 3 for Invis, and 7 for Greater Invis. A divine scroll has a min caster level of 4 for Invis, and 10 for Greater Invis. A psychic scroll has a min caster level of 4 for Invis, and 8 for Greater Invis.

*) The Rogue counts as being a 0th level antipaladin, bard, inquisitor, magus, medium, mesmerist, occultist, psychic, sorcerer, wizard, spiritualist, summoner, or unchained summoner for using such items (you pick one when using the item).

@Bhai: Scrolls are spell completion items.

[Dave Justus]

I agree with Derklord as far as RAW goes.

That said, I would probably house-rule this talent to include automatic success of activation with said scrolls. It is a limited enough list that I don't think it would be unbalanced and by guess is that the author intended that to be the effect of the feat and didn't quite think it through.

[David knott 242]

For #4, you are in the same position as a paladin or ranger of level 1-3. The spell is on your spell list but you have no caster level, so a UMD check would be required to fake one -- but at least that is all you would need to use UMD for in this case.