Lil B’s fave is Celebi, my fave is Jirachi, so it only made sense that they would be best friends!
Aubrey is an adventurous go-getter who likes to explore new areas, where as Jake is more of a shy recluse that just enjoys being around Aubrey. The two have been friends for a long, long time (with legendaries living long lives and all) and travel the world together. Jake tends to help keep Aubrey out of trouble, though she always sticks her nose into trouble anyway.
Aubrey was also the one who dressed Jake, as he was fine without clothes, but it felt weird for Aubrey to be running around clothed, so they had a shopping trip one day and now they kinda match. They’re cute pokepals~