Mmmkay, so if the move hasn't changed from v9 here is how it is defined in the PBS:
689,DECIMATION,Decimation,070,1,DARK,Special,100,10,00,00,1,bef,"The user aborbs the life energy from the target, leaving them completely lifeless."
So, from the top!
689 = internal ID
The next two are the internal name and the display name respectively.
070 is the function code, which if the Essentials wiki is to be trusted means that it is a one hit KO move.
1 = base power, which is meaningless as it is OHKO
Dark = move type
Special = move category
100 = move accuracy in percentage format, so it isn't a no miss move
10 = PP
00 = additional effect chance
00 = single Pokémon target
1 = +1 move priority
bef = move effect flags (Protect/Detect will work against it, Mirror Move will copy it, 10% King's Rock or Razor Fang will cause flinch on opponent)
Last is move description.
So, the safest way to go is a Sturdy 'mon or Tsareena with Queenly Majesty.