
Chemlak |
Pathfinder Adventure Path, Lost Omens, Rulebook, Starfinder Roleplaying Game Subscriber

Rednal is correct: the CR for a mythic creature already includes the adjustment for mythic rank. Easy example: Troll, normally CR 5. Half of 5 is 2.5, rounded down to 2. Mythic rank is therefore 2. Half of 2 is 1. 1 added to a troll's base CR of 5 is 6.
So, without even looking, I know that a mythic troll will have CR6/MR 2, and I leave it to others to actually look that up.
Edit: flagged for wrong forum.