Missing item

[Yuicchi]

Sorry i don't have proof,

But i have a abseil rope.

When i go to the hoenn safari area 6 i wanted to get it. When i climb it ask about a pokemon that knows rock climb. When i cancel it. And check my abseil rope. Its there then, i try to climb again. And ask to use rock climb again. I check my bag then its gone. Please help. It happens not long before the maintenance. I have all the tools as my proof. (Except the abseil rope that gone.)