To be after the Pokémons will be exhaustive, because the hard core & smart ass people of gaming noticed there are Pokémons that only live by nights. You really have to concentrate!
Have a full charged battery on mobile, supportive batteries in your pockets, or know the places, where to recharge. In Finland at least some churches announced having recharge stops and Tampere Hall gave out a newsletter about this lately.
Then, you have to have a day nap in order to recharge your brain energy to chase the Pokémon night growlers. Just like we humans, Pokémons seem to have characters!