Well, I just caught a shuckle and i think it's pretty good. But it has the characteristics "likes to run" and i want a slow shuckle. I do not know as much about characteristics, so do you think it's bad?
Uh... "Likes to run" only means that that IV is highest.
Note that having a certain characteristic does not necessarily imply that the highest possible value for an IV is present. A Pokémon with an "Alert to sounds" characteristic could have a 6 in Speed (and thus very low IVs across all of its stats since none could be higher than 6) instead of a 31 in Speed.
From Bulbapedia.
So that means, Shuckle could still be slow, just the rest of its stats would be worse. See http://bulbapedia.bulbagarden.net/wiki/Characteristic
I wouldnt say its too bad but naturally its okay.But if you want a slow shuckle then you can have the relaxed ability.Its special defense goes up and its speed stat becomes low.Also give it a lagging tail to make it the slowest.