Why didn't the poke balls work?

Question

So I was trying to catch Zapdos with all level 30s and I had it nearly fainted and I threw my poke balls at it(The only thing I had) and it said it missed and I'm very confused now.

Answer 1

Pokeballs can fail at catching a Pokemon, even if it has extremely low HP.
To get the best results when catching a Pokemon, (With any Pokeball, though Ultra Balls work the best, as they are the best Pokeball that you can buy in Red/Blue) lower it's HP and give it a status effect. (If I remember correctly, sleep works the best)

Source:
Knowledge

Comments

K, thanks! I had it paralyzed but that didn't help at all.