Hello to everyones, after i have got all the 6 monsters, will the next monster i get improve to +1 or i can forget about that trial? ty
Only if they are fully Ultra Evolved.
Pretty sure you get +1 regardless of the evolution…?
Correct.
You can get them all to +9. Probably even get bonus potions if you’re already full.
Not sure on that one, will let you know when one of mine hits +9 and I’ll give it an extra go 
No bonus potions, this way you could just farm your potoins at the six trails if that would be possible.
so you confirm that if i get one of them and ultra evolve it, next time i do the same trial i will get a +1 on it?
and which one you recommend to start with?
Ohhhh duh that’s right they had that error when it first came out that why my did not go plus one. Lol