Probably something like this: http://unleashthefanboy.s3.amazonaws.com/wp-content/uploads/2013/05/Helioptile-official-art_300dpi.jpg
Yeah, except Helioptile looks like a dinosaur and almost nothing like the others. But I can kinda see what you mean with the emolga colors and cute face.
There's no rule that says it has to be a rodent. It's a small, yellow and brown, adorable, early-game Electric-type. If there was another Pikachu clone, it would be accused of being too similar to Helioptile. And if they did try to make it different, it'd be less similar Pikachu than Helioptile is.
Socran's Razor: "Never attribute to massive stupidity by someone else, what could be explained by a tiny bit of stupidity on your own part."
True, but all the ones we've had so far were rodents, so it makes sense to expect one. Kinda like how before BW2 were announced, everyone expected Gray Version, because we'd had third versions, and we'd had sequels (GS) but we had no reason to expect a game that was both.
Pokemon Black 2 FC: 1292-6017-5477 (Sid) Statement: Just a simple droid here, ma'am. Nothing to see. Move along.
Pachirisu is great, when you need to catch any Pokémon that isn't a Ground or Ghost Type. It's far from useless. It's not a battler, but it is great for quite a few other things, just like how Smeargle and Ditto are the best for breeding AIDS.