Regarding the Valkyr, its only a 5% dmg difference compared to 15% health :p
Top of my head, Tirisfal Batling, the AT pet one is actually best in BB last I looked at it. But as it was said earlier, breeds where the other options are even worse, the BB is the best. In most 2 breed situations where you got XB and BB, ill take the XB for the slight stat increase.>
In general no pet benefits from a straight out balance setup, that's spreading your points too thin and every pet is used for a purpose, tanky, speedy, hardhitting etc. Theres a reason people use Yellow Moth PP, Emperor Crab PP, SS variants.
The speedy versions aren't speedy enough and other pets with same moveset has better speed options.
EDIT: Golden Dragonhawk Hatchling BB !
(Silver, Red SS)
EDIT2: Senegal BB ! (Cockatiel SS)
EDIT3: Water Waveling can be discussed, HS vs BB. Both shit in my eyes.