Ok what the hell just happened... i was going around when i encountered a Pokémon that i didn't had so i decided to catch it but when i threw my pokèball it made a "SWOOOSH" sound and it only had to tilt one time before catching the Pokémon, when this awesomeness was introduced? in 4th or 5th? and what are the possibilities for it to happen?
What you just experienced was a critical capture, introduced in Gen V. It's pretty unlikely, but the odds go up depending on how many Pokémon you have caught in total.