The tree will then have a random Pokemon from this list, with some Pokemon being rarer than others: - Wurmple (common) - Silcoon (Diamond-only) - Cascoon (Pearl-only) - Combee (uncommon) - Burmy (uncommon) - Cherubi (uncommon) - Aipom (rare) - Heracross (rare) - Munchlax (very rare)
If you wait longer than 24 hours, the Honey on the tree will lose its potency, and whatever Pokemon would have been on it will be gone.