Everyone is like "Oh yes, I remember this that and that". Are you people ignoring my post completely? I said I tested this on the Red version, and while I was frozen a ton of times, I couldn't freeze Articuno even once with Ice Beam. So unless it's 1% freeze on ice types instead of 10%, IT IS NOT POSSIBLE TO FREEZE ICE TYPES IN GEN I.
You'd think people actually read the posts above theirs. >_>
Meet Articuno. First you need to use the attack to freeze articuno. Then use false swipes until articuno's hp is down to 1. If he/she unfreezes, freeze him/her again.
Ice-type Pokémon cannot be frozen by Ice-type moves except in Generation I; however, they can be frozen by Tri Attack