How do you catch an Abra in yellow version?

You catch Abra in the 3rd City or 4th,i mean near the 3rd GYM,look for him in the grass,or u can find him more bigger level in Lavender Town near the Pokemon Center,go left there are a bunch of trainers,keep moving there u see a tree,cut it search for him in that grass,YOU CAN ALSO FIND KADABRA THERE!!!!!

Its hard to catch him, i used butterfree and used sleep powder then hit him a few time to weeken him, just once or twice depending on the lvl of it then i threw a Pokemon ball and tah-dah, got myself an Abra, goodl uck =]