From Bulbapedia, the community-driven Pokémon encyclopedia.
Mount Hideaway (Japanese: ミヤザキ山 Mount Miyazaki) is an anime-exclusive mountain located near Pallet Town. The rugged area is home to unusually large Onix. Something in the soil causes the Onix to grow to gigantic proportions.
It is also a training area for Kanto Elite Four member Bruno. While training for the Indigo Plateau Conference, Ash and Brock decided to find him and seek his advice on training in To Master the Onixpected!.
Pokémon seen at Mt. Hideaway
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