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If the title misleads you, what are the chances of getting an item or a Pokemon in the grotto? I ask this because none of the Grottoes have a Pokemon in them.

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Typically, when you go to an area, once you've mined it for its interactable Pokémon and items, it is useless, the Hidden Grotto is different. The contents of the Hidden Grottos change and get regenerated repeatedly.Whenever you take 256 steps in the game, there is a 5% chance that each of the Hidden Grottos will be regenerated. When it's regenerated, there's a 40% chance of an item, a 40% chance of a hidden item and a 20% chance of a Pokémon. The chance that it regenerates can be increased using a Pass Power.

All Hidden Grottos and their respective chances of appearing Items/Hidden Items and Pokémon can be found HERE.

Source - Serebii
Hope this helps!

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This is the answer I wanted.........THANK YOU!
U welcome!
ShinyFire, I would have tested this on my own Black 2, but its not with me right now
5% is really low, I spend 17 hours to caught a Gligar to get a Poison Heal Gliscor!
I'm a shiny hunter and this is most likely a thing of pacience.
Good luck!
Yeah, my shiny Chikorita is on my Heargold! ( By the way )
Mine was 1414 SR in SS c:
More questions about the Hidden Grottos, ask me here.
Thanks man, but one more thing. I have a Shiny Guide for starters!
1. Get on the game with the respective shiny
2. Soft Reset, but as you can find 3 starters, the chances are TRIPLED to 1 in 2697.3 in Gen 2-5 and 1 IN 1365.3 IN GEN 6!
3. Profit!