If gen V Pokémon are added and I get a Snivy, I definitely won't be evolving it. Its one of my favourite Pokémon and it's evolutions are no were near as cool.
I've been thinking about this a bit and I might just keep my Alolan Vulpix unevolved all the way to 100. Makes sense since I already have an Alolan Ninetales anyway.
There's some I'll keep unevolved but that's because I plan on sorta getting a living dex on LV so some mons will never evolves so I can have one from each stage in all lines.
I mean, until they reach a sufficient enough level, yeah, I won't evolve them. 3 posts per level versus 5 is a big difference XD
also I've been thinking that if I ever catch a Bulbasaur I might just keep it unevolved. ... if it's a shiny, that is.
nah, I'll evolve them just to have their evolutions, but if I already have their evolutions then I'll keep them unevolved.
I kinda wanna keep Shelgon and Vigoroth unevolved... mostly because it'll take years to evolve them LOL
Might evolve one of my shiny Snivy and keep the other one unevolved. I don't want to evolve my Pumpkaboo either since it's one of the few ghost types I really like and I hate it's evolution.
I kinda wanna keep my Shiny Caterpie as it is... The meme potential is too strongr X3 Also I don't like Shiny Butterfree >: (
I have shiny Psyduck and Piplup I would never dream of evolving. I also won't evolve my Gastly because if I did the Venustoise nickname wouldn't work anymore. xD
When I finally find a Croagunk, I'll probably keep it like that and not evolve it (Toxicroak is a fine Pokémon, but Croagunk is definitely my favorite).