You will need to have a Firered or Leafgreen game that does have kabuto trade it to you.
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Kabuto is the Dome Fossil, and Omanyte is the Helix Fossil. An easy way to remember is that a helix is a spiral, and hermit crabs, such as Omanyte, have a spiral shell.
Kabuto is in the dome fossil and Omanyte is in the helix fossil.
The fossils are obtained in mt moon and the pewter city museum. Either you will get kabuto or omanyte from mt moon depending on which fossil you chose Omanyte=Helix fossil, Kabuto=Dome fossil. Aerodactyl is the old amber you get at the pewter city museum send these to the lab at cinnibar island to get revived!
After you defeat Brock in the Pewter City gym, you can head EAST to Mount Moon. There you will find two fossils: Dome and Helix. The Dome fossil will give you a Kabuto, while the Helix will give you an Omanyte. You can only choose one or the other so choose carefully! If you already got the Helix fossil, you WILL NOT get Kabuto, you will get Omanyte and the only way to get Kabuto is by trading. I know its a bit unfair but if you breed your Omanyte later in the game in 'Four Island' maybe you can give a baby Omanyte to someone as exchange for a Kabuto. I have Leaf Green and Fire Red so I chose Dome in Fire Red and Helix in Leaf Green, then bred them and got them both for my PokeDex. So your best bet is to get both Leaf Green and Fire Red then trade. Good Luck!!!
In all honesty, it is up to you. The Helix Fossil is an Omanyte, while the Dome Fossil is a Kabuto. Personally, I would suggest the Dome Fossil, just because I love Kabuto.