I can't find 2nd slot in the friend safari

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1

I am at the 7thgym and I can not find the 2ndslot of the friend safari. help me please

2

Don’t worry, there won’t be a second place appearing in the safari. Actually, it will simply add another possible Pokémon you can encounter in the grasses already inside the safari.

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3

oh okay thank you

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4

and therefore when is the 3rd slot unlocked?