[Coda]

They totally help. They're 3x more potent than a Razz Berry.

Catch bonuses:
* Poke Ball: 1x, Great Ball: 1.5x, Ultra Ball: 2x
* Razz Berry: 1.5x, Golden Razz Berry: 2.5x
* Curve ball: 1.7x
* Nice: 1x-1.3x, Great: 1.3x-1.7x, Excellent: 1.7x-2x
* Bronze Medal: 1.1x, Silver Medal: 1.2x, Gold Medal: 1.3x

Yes, this means "Nice" could potentially not be any better than not hitting the inner ring at all. It actually scales with how small the circle is and the message just gives a hint.

If a Pokemon has two types, the medal bonuses average (so if you have a Silver medal for Normal types and a Bronze medal for Flying types you'll get a 1.15x bonus against a Fearow).

So your odds of catching a legendary with a single Premiere Ball using Golden Razz Berry and landing a Great curveball is about the same as if you had landed 6-7 Premiere Balls with straight throws and no Great.