Eterna Forest is the Sinnoh forest, which splits Route 205 into two parts. On its deep north is located the Old Chateau, although it will be blocked by an unknown force until completing the Eterna City gym. It will also be necessary to bring Cut in order to reach it.
Following the tradition, the Headbutt tutor is also found in the forest. However, the style for Headbutt Trees changes, now being all packed together in the north side, beyond Cut trees.
Notable miscellanies
A Move Tutor for the move Headbutt can be found in the south-west part, a bit north-west from Psychic Kody. He will teach the move to any compatible Pokémon for the price of 
1,000.
A Move Tutor for the move Horn Leech can be found in an obscure location in Eterna Forest. This area can be accessed via Eterna Forest Cave, once in the cave the player must head to the north-west ladder to reach this secretive location where the tutor is located. She will teach the move to any compatible Pokémon for the price of 15,000.
Wild Pokémon
Land
Items
| Item | Quantity | Cooldown | Location |
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Antidote |
1 |
Not respawnable |
On the upper far west side of the forest. |
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Paralyze Heal |
2 |
Not respawnable |
In the south-east part, along the eastmost path. |
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Great Ball |
2 |
Not respawnable |
In the far north, next to the Old Chateau. Requires Cut. |
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Insect Plate |
1 |
Not respawnable |
Hidden item. On the plant immediately to the east of the Old Chateau. Requires Cut. |
NPC Trainers
Eterna Forest Trainers |
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All NPCs cool down after 7 days unless noted contrariwise. |
1,000.
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