You can't you have to trade.
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only if you trade with a friend
You have to trade with a friend at a pokemon center. I suggest trading kadabra for hunter. They will both evolve.
In the Hoenn Dex, there are 200 pokemon. Kadabra, Graveler, Machoke, Clamperl and Seadra don't evolve without trading, so you can't get Alakazam, Golem, Machamp, Huntail, Gorebyss and Kingdra without trading. Also, you can't catch both Latias and Latios, so you need to trade to get them. For the full Pokedex, go to www.pokemon.com and click on Pokedex.
I hate to say it but you can only get 1, so if you chose already... Hope you didn't really like the opposite one. Oh, and you can get the other by trading with a buddy. The alternative is using a cheating device of some kind, such as Gameshark, but don't. Cheating is lame.
In Pokemon Emerald, both the Root and Claw fossils can be obtained. One may be selected at Mirage Tower and the other will be found at the end of the Desert Underpass.