RE: Shaking your 3DS to catch Pokémon?
1. Last generation.
2. The more full your Pokedex is, the more likely you are to get a Crit Capture.
Wailady said:That's known as a Critical Capture I think. A new feature introduced this generation.
I don't know what effects the chances of this happening, but I think I read if the your Pokemon in battle has high PokeAmie stats, then the chances of a Critical Capture are increased. I'm not for certain though.
1. Last generation.
2. The more full your Pokedex is, the more likely you are to get a Crit Capture.