I caught a 100% Snorlax but that was way back when wild IVs were flawed. Plus he has ZH/EQ.
I went to my favorite water spot late one day and caught two Dragonaires. One was level 29 (76%) and one was level 29(78%). I had enough candy to raise them up in short order and they both got DB?DC. My only ones with that moveset and I evolved them just in time to avoid that moveset becoming a legacy. If I had waited who knows what I would have drawn. So on the whole that was my best catch.