This request can be picked up from Dagero, the old man who runs the photography studio. When you speak to him, he’ll show you a photo (see below) and ask that you catch the Pokémon in it. The picture shows the steps up to Grand Tree Arena in Obsidian Fieldlands and the distinctive fluffy ears of a .
Where to Find Buneary in ARCEUS¶
The picture that Dagero gives you offers an example of where’s easiest to catch yourself a Buneary - the area near Grand Tree Arena. You’ll be able to find a fair few around that area and you can catch them unawares or battle them - they’re aggressive so they’ll attack if they spot you.
Once you have yourself a buneary (we caught a randomly spawning Alpha Buneary!), head back to the photography studio and show Dagero the Pokémon. Upon finishing this request, you’ll earn a new photography option at his studio.