While waiting for crush to say his prob. Let me ask some questions

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I'm about to go to the north cave, I've been there and faced sephirot but I haven't fought him because its time for DBZ so I tuned the PS off without saving it :cry: .
Before I go to North cave, I want to get All of their Level four limit break, But I only aquired Cid's Highwind. Where are the rest?
How many weapons should I face, I beat the one who is flying by and I thought that's all. But I saw two more weapons, one under the sea and one under the dust (near gold saucer). Both of them are Damn pretty strong. So any advice for me?
Now raising my chocobo, How can I get the ocean chocobo and How will I gradually increase their speed because I reached class S and they were faster than road runner.
Pls. give me some * :idea: 's ok? :thumbsup: