You get gems by increasing your flag rank in your secret base in the underground. You rank up when you capture other peoples flags.
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He is in Eterna city next to Pokemon center!
yes. you talk to the underground man in eterna city in the house next to the Pokemon center and he will give you a kit and you use it to go underground.
in Eterna city, you will find the Underground Man. he is in his house. Talk to him, and you will get an explorer kit.
You get the explorer kit when you visit Eterna City. You have to go to the Underground Man's house and he will give it to you.
in eterna city