Purity Forest Dungeon Strategy Guide and Encountered PokemonComment

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You're better off using Heracross with the rare quality Rapid bull's eye. You start with the moves bullet seed and arm thrust and if you don't, reset the first floor until you do, early on you can find Dustox around lvl 20, recruit one with moonlight and it will keep you healed when you take damage for the whole dungeon, at floor 90+ watch out for altaria, in 2 turns sky attack will wipe out your whole team if you're in a corridor so stock up on orbs and wands if you run into any.

As an additional tip, recruit Teddiursa. It has a high chance of having the Pick Up ability, which can generate extra reviver seeds, berries, tms, orbs, seeds, and what not. I also can recommend getting Illumise asap, it will spam moonlight when any party member is low on HP, helping save oran berries.