So! News that probably no one cares about, but I've finally met Pokémon GO's challenge requirements for reaching level 44.
Background
Back when they increased the level cap over the original limit of 40, Niantic also added four special challenges per level that need to be completed before advancing, in addition to increasingly hefty experience requirements. Some of them have been pretty neat, like catching 200 in a single day or evolving Eevee into every possible form. And then there's the challenges for level 44.