I tend to like evolving my Pokemon, particularly since it provides a sense of strength and progression. As of now, the only Pokemon I plan to prevent evolution of is
Scyther :t123: (although I plan on owning a separate Scizor as well), mainly due to the Base Stat Total (BST) of 500 uniquely not changing upon evolution (along with the secondary typing being drastically different), permitting Scyther to play differently (
as in, get smushed by rocks more) when juxtaposed with Scizor :t212:. I mean, if the Base Stat Total doesn't change at all, I don't see why I should regard the entity as a proper evolution - you might as well make it a classified as a counterpart Pokemon or a Forme Change. {XD} Plus, I feel that Scyther's design is worthy of being allocated to a "fully-evolved Pokemon (which Scyther used to be at one point in time prior to Generation 2)" rather than a pre-evolution; while Scizor's "modified miniature scissors" can make sense as a logical progression from dual giant blades, I feel like the link between Scyther and Scizor was kind of after-thought-ish for some reason.. >_>
i usually evolve then whenever possible however in some instances if the evolved form dosent learn any(many) moves i might keep it pre-evo till it learns something specific then evolve it. notable examples are most stone evos. i would usually wait for flame wheel on growlithe or petal dance on gloom before evolving. however if the poke can learn a variety of strong moves after evolving (TM or otherwise) like Starmie or Nidoqueen. i'll evolve them as soon as i can.
This; I think the only one I did (a while ago) was delaying Mudkip's evolution in
Pokemon Sapphire so that it could learn Hydro Pump at Level 40 (which I guess would be largely useless now, due to Hydro Pump missing and getting nerfed in Generation 6, not to mention Swampert being physically-offensively-oriented, anyway..). {XD} I intended on preventing Vigoroth from evolving into Slaking purely because of Truant, but I think that Slaking's statistics are worth the Ability trade-off (at least in certain scenarios; maybe not so much in competitive settings).
I don't really remember an instance that I've kept a Pokemon for its looks or anything. o.o I've always trained so I could evolve them, so they can become stronger Pokemon, in the end. While yes, it sucks it lose that cuteness factor in some, the results afterwards is usually worth it.
....lol I like how this is the most robotic response I've given so far. >.<;
This; typically, I train my Pokemon with the intent of eventually fully-evolving them. {XD} While I like some Pokemon for their cutesy aesthetics, in the end, I value power/strength and accessing a Pokemon's full innate capabilities.
I usually evolve as soon as I can. The only exceptions I can think of are for Pikachu getting Thunderbolt and Spearow getting Aerial Ace, both in FireRed.
Wow; Generation 3 games seem to have done this a lot - giving pre-evolutions access to moves that their evolutions don't have.. First, it was Poochyena with Crunch; now it's Spearow with Aerial Ace.. Thank goodness that most of these move discrepancies have been rectified and corrected in Generation 6, at least.. The only case I feel where the "pre-evolution learns moves that evolutions cannot" mechanic could be maintained is in Pokemon whose evolutions are triggered by evolutionary stones. But even then, I have a feeling that this "mechanic" will be revised/abolished soon enough, due to being a
Scrappy Mechanic in that some learnable moves being "lost forever" upon evolution if you are unaware of the "mechanic".. Seriously, if I didn't pay attention to Bulbapedia's learnsets and such, there would be so many moves that I would have missed. I am kind of anticipating of personally documenting "potentially missable moves" someday (Poochyena and Crunch in mind was documented until Generation 6 fixed that issue), so that I don't screw one of my competitively-oriented Pokemon over when migrating or something.. >_> IIRC, Eevee and something with Solar Beam (Gloom?) are still affected somewhat by this "issue"..