I love this guy so fucking much.
Here's what I have to say about Ambipom and Chilachino being the same: How? Yes, they're both normal-types, but they fulfill very different roles. One is intended to be a Fake Out Lead or a Baton Passer, whereas the other one abuses two of his abilities, Technician and Skill Link, to the fullest. Sure, Ambipom has Technician, but the only attack he can use to take advantage of it is Fake Out, whereas Chilachino gets a variety of multi-hit moves boosted by Technician, providing much better coverage. Ambipom's Attack may be higher, but only by five base points, and Chilachino still makes up for it with nice coverage (and cuteness, but that's beside the point). Chilachino also has higher defenses.
Overall, I consider them very different, but both are useful in their own different roles.