If you mean the Town Map, you can simply talk to the old man at the entrance to Cherrygrove City, let him give you a tutorial and tour of the city and at the end, that's your reward.
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Berries are found on berry bushes scattered around the map.
In Pokemon Crystal.
What the hell is a Pokemon crystal
There is no Groudon in Pokémon Crystal.
You can find it in Pokemon Platinum, Pokemon Crystal, Pokemon HeartGold, and Pokemon SoulSilver.