This is just a guess but it might be Mjolnik's (the Paldean Tauros guy) scene. Checking the bond menu, you'll find that he got a lot of scenarios and he's probably one of the two characters as of now that's more incline to have any nature related CG name. It helps that the gallery sort the CGs by characters to come to that conclusion, it just a bit of a work since you have to visit the guy a lot cause it might be the Bond Level 2 scenario that gives you it and you can only visit him every 4 days on the free day. At least it feels like a dragged for me since I'm more interested in Grimwald (Dusk Lycanroc Guard Captain), I'm a freaky wolf lover.