Is there a proven black dragon route?
No guaranteed route is established by the official pages reviewed here. The official FAQ offers a broad availability statement, not a choice sequence for a specific color.
The battery-percentage rumor
Threshingday.top discusses a 76–90% battery claim and labels it unconfirmed. We have not independently tested that claim or established that battery level controls a result.
For a useful comparison, ask for the original report, its date, the available choices and the full outcome. A successful screenshot without the earlier context leaves too much unknown. Keep enough battery to use your device normally.
After a disappointing attempt
Record what you remember in your own words. Separate meeting a dragon from recording a bond. Keep uncertainty visible and compare observations without calculating a success rate from two notes.
Write and compare notes How to read a route report Prepare a return reminder