My ridiculously far-out guess is azurill. I skimmed the riddle for words which could be misspelled, and came out with this thought.
I may seem very run-of-the-mill at first glance, Azurill is a normal type
But I will prove you wrong, if you give me the chance. Azurill doesn't stay normal type
The vocal one hates me, but sometimes, you’ll see, Azurill gets a lot of vocal hatred for being small and weak
The voice of the vocal trades places with me. Not sure here.
If you want me to be yours, then you’ll need one cent, I'm figuring here it's "scent" misspelled here as "cent", the "scent" being incense needed to breed azurill.
But compared to Lunesta, it’s very well spent. Not sure about here either.
I cannot read Braille like Ms. Helen Keller, lacks fingers
And please proofread this. I’m a terrible speller. You said part of the riddle was misspelled, my guess is that "cent" really doesn't mean a coin.