Just a quistion ...

What monsters should i prepare before going to bl expert ? I hear people talking about how hard it is ...
I have : Pod 60 scythe , pod 60 flight , pod 55 meniss , 52 smiter , 55 adapt cygness , 55 force rhor , soon i will have a gryphion with pod .. Those are the monsters i usually use for stages , i have 51 pewgway and accel neon but ik they wont help ...
What should i get new / train more ?

[Koenaj]

I know this isn't the answer you're looking for, but I'd go for whatever you think is needed.
People can tell you to use OELs, or get a Leviathan, but if the monsters on that stage have an elemental advantage, it'll be wasted effort.
I don't think, however, that someone managed to pass BL Expert 15 without OELs at this very moment, so you might want to stack up on Ressurection Cards big time .
Best of luck!

Definitely get a Levi.
I'll say your team is good enough to make it up to expert 7 as of this point.
Though epics just don't cut it in barren, even free legendaries don't cut it.

Apparently Angelo's are a great help. Use 2 intimidates in sunny, sand, and no weather stages and 2 unnerves in blizzard stages. You should have healing skills on all possible monsters. That'll be huge since pp resets every battle and a lot of maps are no items.