While leveling a new addition to my team, I noticed that her "Orange" attributes (Physical/Magical Mitigation, Crit Chance, Avoidance Chance) all went down upon level up instead of improving, though all her other stats improved. Why does this happen and is it intended?

That should not be the case. Physical/Magical Mitigation, Crit Chance, Avoidance Chance are based on the pet's stats, so since the stats increase when a pet levels up, those attributes should increase as well.

Could it be that you've changed their equipment when you leveled up your pet? Equipments can give different boosts to all stat attributes, so if you did change something, it might be from that.

If you're pretty sure it happened even though you didnt change anything, you might want to post in the bug forum. If you can reproduce the problem and screenshot it, it'll probably help as well.

This is correct.

The percentages shown are calculated based on the pet's level. The stat requirements for equal benefit increases with each level gained (otherwise... 10% crit at Level 0 with 10 Dex would be 100% crit with 100 Dex... which is very easy to obtain at higher levels).

So when a pet levels up, the 'requirement' to maintain the same percentages increases by more than just the base of +1 gained to each stat when the pet levels up.

Starting with Level 60+, there will also be large step ups, where the requirement increase is even more significant. This is attuned for the MegaZone.

So.... it does increase, but it's a small proportion and not equal to the stat increase, right?

*tired, so not sure if my brain is understanding things correctly...*

Yes? I think.

So, here's an example with random numbers b/c I don't feel like looking up the real numbers lol:

I'll use Critical Hit Chance since Dexterity is the only stat used for calculating it - keeping it simple.

Let's say that at Level 10, it would require 20 Dexterity to have a 10% Chance to Crit.

Now, let's say at Level 11, it would require 22 Dexterity to have a 10% Chance to Crit, but the pet only gained 1 point of Dexterity from leveling - so its Critical Hit Chance vs equal level opponents actually decreased.

The bolded part is important. Mitigation, Chances, and Bonuses are always calculated based on the attacker (or recipient's) level. The stats that you see on pet's profile pages and elsewhere just display vs an equal level opponent.

So given the same example above, if that Level 11 Pet went and fought against a Level 10 Enemy, its Critical Hit Chance would have actually increased because now it has 21 Dexterity instead of 20, but that Level 10 Enemy still uses the Level 10 calculation (because it's Level 10).

If that Level 11 Pet fought a Level 20 Enemy, its Critical Hit Chance would be significantly lower than what's displayed because it'd be calculated against Level 20 - not against Level 11.

Hopefully... that helps explain it a bit more. =P

Oh, I think I get it. That explains a lot! So the stats only seem to be going down, but if my level 10 pet continues fighting level 9 opponents she'll have a higher crit chance than before against them (because of the increase in dexterity upon level-up) even though the numbers seem lower, but there's also an increase in difficulty with each level so that it isn't totally linear, right?

Does this mean that a level 60 pet will pretty much always crit against a level 10 pet?

Yep. That's all correct.

I don't quite know what a base Lvl 60 pet has against a Lvl 10 enemy, but yes, it would have a significantly higher chance to crit vs them than vs a Lvl 60 enemy.