You need the National dex, and then there is a new part of the Safari Zone He will be there.
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Teddiursa evolves at Level 30.
Teddiursa can't be found on firered trade one from emerald to firered.
In Emerald you catch a Teddiursa in the Safari Zone and evolve it.
tediursa evolves on level 30
You cannot catch teddiursa in leafgreen to get one you can catch one in emerald or get one from Pokemon colosseum or even Pokemon xd gale of darkness.