I just started nicknaming pokemon, and honestly I don't know how i got through the games without it before.
I usually only name my favorites though, ones that will for sure have a place in my team, but also only when I feel it fits.
I can only remember a few right now but, let's see there's mudkip the oshawott (now dewott), Akira the abra (kadabra) , ALI the primeape, Jason the sandshrew (because he becomes a slasher) and now I have Madoka the cleffa.
That's most the good ones i can remember, but i also have a bidoof I'm thinking of naming either thanos or broly, haven't used him much yet though.
Oh and I forgot StoneOcean the Butterfree & MONSTAR* the shroomish
nevermind I already named my bidoof Shaggy. ;)