You don't battle it. Purity forest (assuming you are talking about PMD red and blue) is a level one dungeon, which is where your level is temporarily reset to level one. In this dungeon all items and money are lost forever if you try to go in there with things. Also, you can only bring one Pokemon with you and none will join your team in here except for Celebi. This dungeon is 99 floors. Bring someone with fast level-up and HP, like Kecleon, Pichu, or Mewtwo. I used Kecleon. Good luck and DONT GIVE UP! :)
You get Celebi by using codes or glitchs Depends on what game. In the normal versions, you can use events or codes and glitches. In mystery dungeon, you need to find Celebi'[s dungeon.
purity forest
Celebi joins your team in Purity Forest on the 99 floor.
you clear purity forest and celebi automatically joins the team without a battle
Clear Purity Forest, it will automaticly join you in b99f
you beat mystery dungeon red rescue team after you prevent the meteorite and defeat RAYQUAZA!
Yes, you can find Celebi in mystifying forest if you have the secret slab and go to the 10th floor.
10
u have to defeat bulbasuar
you defeat them and some will join
YOU CAN GET CELEBI ON POKEMON MYSTERY DUNGEON EXPLORERS OF DARKNESS! FIRST YOU CAN DO THIS: ENTER THIS CODE IN ACTION REPLAY: Celebi(pink) 122ad628 00000116 Celebi(green) 122ad628 00000117 OR GO TO:http://us.codejunkies.com/search/codes/cheat_codes.aspx?selp=17&game=Pokemon-Mystery-Dungeon--Explorers-of-Darkness&gameID=17826390&page=3 HOPE THIS HELPS! THESE CODES WORK! I REPEAT WORK! THOUGH IT MIGHT GET RID OF MEMORY FOR YOUR ACTION REPLAY. USE WITH CAUTION.
Defeat them while you're in their dungeon.