Are rats good pets? (Please read the description as I have other questions)?

Please answer these:
Are rats good pets for 13 year olds that love small rodents/animals?

Do they take much looking after?

Do they smell? Can you litter train them?

How do you prevent them from diseases?

Which is better? Male or female?

Thank you
Update: I meant a pet rat, not a wild one. Why would I go out and catch a wild rat when I can get a pet one?

Also, are they better from breeders or pet stores? I've heard breeders are better as pet store ones can be ill? If I got a pet store one at a young age would it be okay? Thanks
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