Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
A Sassy nature, on the other hand, greatly increases Pyroak's survivability by giving it above-average SDef, to go with its already excellent HP and above-average Def. You do sacrifice a bit of power, but the trade-off is worth it, take it from an experienced Pyroak user.
Third, you may want to change Monohm's nature to Modest, seeing as Cyclohm doesn't have much use for physical moves.
Hi! Thanks for the advice! I'm unfamiliar with CAP pokemon and ASB in general, so every bit of advice helps! I've decided to run a Sassy nature on my Embirch, and I was a little iffy on how the calculations with speed worked. I divided by 1.15 and rounded down, giving me 52 speed, is this correct? Anyway, thanks for all the advice, and I'm looking forward to ASB!
Third, you may want to change Monohm's nature to Modest, seeing as Cyclohm doesn't have much use for physical moves.