Final Fantasy X riddles

[SaveOurSeeker]

Let me add a hint;

(SPOILER)Even though we're kinda rare,
when we do show up it's usually in pairs.
And even though you're strong enough we don't really fight that much -
you'd rather fill our money pouch.
You'll spend quite a lot of time finding us,
but you'll make up for that once you have enough.

I'm gonna say Tonberry