looking at the page here for the basis of Cait Sith's abilities. The link leads to gamerescapes page for the Distorter of Time fight in WotG. (Fight against Bad Cait Sith and Atomos)
Cait Sith uses the following moves
Regal Scratch
Divine Favor - removes all negative status effects by the power of Altana.
Mewing Lullaby
Eerie Eye
Level ? Holy
Thinking about the terms of who Cait Sith is after looking at this fight puts me more at easy with Cait Sith having the raise abilities. Since she is the messenger from Altana.
In the fight Atomos seems to have 2 abilities.
Soul Vacuum - AoE All Status Down
Soul Infusion - Bestows all drain status to target
If Atomos is a 2-hour avatar. Soul Vacuum would make sense as a BP. Actually both could be done with an interesting mechanic. where after you drain the enemies, it would enable a blood pact: ward that would allow the summoner to Bestow all of the status to a target. That would be really cool.
Note: the soul infusion would have a 0 mp cost since you would no mp. Also Atomos would stay out until astral flow ends, he is dismissed or Soul Infusion is used.