Well, anime Pokemon evolution tends to be sporadic, so I guess it's a pretty interesting event to see... (plus, since the anime hardly ever references Pokemon leveling, Pokemon evolution can be
very unexpected.) In any case, it feels like a very rewarding event...especially when you have to undergo (sometimes monotonous) Training in the games. And hey, everyone loves it when the starter Pokemon evolves! That cute ally you started out with earlier has just toughened up to reach a whole new level of EPICNESS!
I mean, catching a Pokemon is all nice and dandy. You're like, "Whoa! I got a cool Pokemon!" When it
evolves, you're like "*gasp!* It gets
stronger?!" Well, if you're playing a Pokemon game for the first time with no advance knowledge, I'm thinking that's what it tends to feel like... Anyway, I guess they just try to preserve the magical/mystic sensation during an amazing unexpected event... :D
And as long as we get to hear epic pieces like this, I'm not complaining! :D
https://www.youtube.com/watch?v=jaHs1GSHMI4 (I know it's not the anime version, but it still references the same event - well,
half of it does!)