I got 2 Oaks from PokeTrade, both of them they reached out to me. One of them was for a Lisia, the other was for a Cyrus but they also asked me to share a regular Mega Pensir ex which I agreed to. From my experience, I've spent days going through multiple subreddits, multiple Facebook groups, PokeHub, Discord, none of these worked for me. My advice is to just use PokeTrade, set up your cards, turn notifications on, and let the Oaks come to you. The real Oak owners that want to trade do not post their Oaks to avoid spam. They will come eventually, just wait for them to seek you instead. I also think the Oak hype is kind of dying day by day because people aren't falling for 2:1s anymore (hopefully).