I cannot complete this Quest:

"Capture a tobiano horse".

I have seen that some breeds cannot be captured with this pattern, but i don't know If I'm missing something or if is a bad luck.

Tobiano is a pattern correct? I can pick them in the Beach?What breeds i can pick with? I tried a few times with ponies and nothing showed up yet.

It's only a small chance to get patterns and which one it is stays a gamble^

KNN and TB can't be captured with it.

Your best bet would be to use some "Patterned Capture" items^

Then it's fully a gamble, thank you Kodiak! :)

Yes^

Your best chance at Tobi is to just use the pattern capture item though, because it guarantees at least 1 pattern^

I usually complete the quest by capturing warmbloods and patterned capture tokens in the jungle. They can't have appy so it narrows down what pattern they can be caught with a little ^^ if I run out of patterned captures I switch over to free capture tokens at the beach.