As a person who typically doesn't nickname their Pokémon, I think I've found the joy in naming them with my post-game team. Note they're still in training, but right now I have with me...
Lux the Shinx
Wasn't really creative with this one, but you get the idea here.
Pixel the Shiny Togetic
Was originally going to be the name for my Vivillion, but I decided to give it to my Togepi instead.
Toothless the Mawile
Kind of like calling the big guy in the group Tiny.
Ness the Dragalage
Even though Dragalage is based on a totally different species, I named her Ness based off of Nessie the Loch Ness Monster.
Sybil the Espeon
Sybil like the oracle. It seemed fitting since Espeon is a Psychic type and it's a girl!
Excalibur the Honedge
Need I say more?