There's a Blaze beetle hybrid? are you sure? It might have just been a rain beetle, they resemble the Blaze beetle in shape, but not in color. Or you might have just seen a storm beetle. You do know the Blaze beetle is fire, right? Otherwise I don't know how they got such a pet.
It was DEFINETLY blaze beetle color it was orange and black kinda like lava, and it came with a blaze beetle card that gives an effect similar to that of the new fire card the gives 3 traps (this gives 2 blades)
I would not be supprised. Nightmare is a cross between a level 48 school pet (helephant) and a starter pet (unicorn). You just have to figure out which level 48 or 58 school pet was crossed with which starter pet. I warn you, it might not make sense! helephant is fire unicorn is life and the result, nightmare, is death. If you do get an answer remember that trying to get a hybrid often fails. Also remember people lie about this kind of thing for fun, the mods won't correct them because it would be a spoiler. Be cautious.
Oh I did some research and I think I found the Blaze Beetle pet. It seemse to have been a rare pet from getting a high score in KIFreegames during Pet-A-Palooza, and that in the future it is said to become on of the very first craftable pets. Hope this helps. :D
