Select Custom Game Room from the menu.

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Choose private room.

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change the settings as described below:

• Lives -ㅤㅤㅤㅤㅤ99
  
• Match time -ㅤㅤ25:00
  
• Damage -ㅤㅤㅤ300%
  
• Max Players -ㅤㅤ2

Match time can be changed depending on your needs, please read FAQ.
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add a bot and change the difficulty to pushover(This part is important and could ruin your farm if it is different).

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Select Small Brawlhaven or similar smaller ones (avoid using larger maps or maps with platforms, this will make the method difficult).
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Disconnected from the match.

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This is the most important step in the tutorial, when you are out of the match a bot will take your place playing for you and if you return to the match it will continue playing until you perform an action in the game.
click Rejoin Game
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Within the match, let the bots fight until the time runs out, at the end you will receive the rewards as if you had played.
Note: Now you can wait for the game to finish or use Windows key + D or Alt+Tab to minimize the game (it will continue to work as long as you don't take an action in the game)
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This method can yield up to 1000 XP and 250 gold per match

explaining the mechanics of Brawlhalla, every time you reach an odd number after level 6 you can earn 120 gold, taking advantage of this mechanic you can get 370 gold per farm if you level up a character to an odd level above 6(from level 21 you will only receive gold).

For better understanding, see the table:
(https://brawlhalla.fandom.com/wiki/Leveling)
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another way to earn more gold is to wait for Double XP & Gold Weekend

Remembering that: each minute in a Brawlhalla match is equivalent to 40 XP, you can calculate the time needed to reach the desired level!
(https://brawlhalla.fandom.com/wiki/Leveling)

Q: How many hours would it take for me to unlock a character with this farm?
R: 9h or 540 minutes, however, it can be reduced with the level mechanic

Q: How does the Brawlhalla reward work?
R: Damage per minute

Q: What is the maximum reward I can receive per minute?
R: 40 XP and 10 Gold per minute (by changing the match time, you can get the reward you want)

Q: How much damage per minute should I deal to receive the maximum reward?
R: 166 damage(100% damage) or 500 damage(300% damage)

Q: How long does it take to go from level 1 to level 5?
R: 40 minutes

Q: How can i see the remaining time?
R: changing this setting