How Do You Get a Thunderstone in Pokemon Black 2

POKEMON BLACK 2 AND WHITE 2 HIDDEN GROTTOES

Hidden Grottoes can be found over the whole world. There are twenty in total in Unova, and can be recognised by green foliage between two trees; examine the area and you will be prompted to enter the hidden grotto. When you enter, you may find a wild Pokemon with its Hidden Ability, an item ball, or a hidden item. If a grotto is cleared of its contents, it will regenerate again after 256 steps.

Floccesy Ranch
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Dunsparce Rattled 1% Lv10 - Lv15 Herdier Scrappy 4% Lv10 - Lv15 Marill Sap Sipper 15% Lv10 - Lv15

Route 5
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Minccino Skill Link 1% Lv20 - Lv25 Liepard Prankster 4% Lv20 - Lv25 Foongus Regenerator 15% Lv20 - Lv25

Lostlorn Forest
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Pinsir Moxie 0.25% Lv20 - Lv25 Heracross Moxie 0.25% Lv20 - Lv25 Pinsir Moxie 0.75% Lv20 - Lv25 Heracross Moxie 0.75% Lv20 - Lv25 Leavanny Overcoat 4% Lv20 - Lv25 Combee Hustle 15% Lv20 - Lv25

Route 6 - On the west side near a Pokemon Breeder
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Dunsparce Rattled 1% Lv25 - Lv30 Woobat Simple 4% Lv25 - Lv30 Foongus Regenerator 15% Lv25 - Lv30

Route 6 - Near the entrance to Mistralton Cave (Requires Surf)
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Moon Stone 0.25% Sun Stone 0.25% Shiny Stone 0.25% Dusk Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Nosepass Sand Force 1% Lv25 - Lv30 Woobat Simple 4% Lv25 - Lv30 Foongus Regenerator 15% Lv25 - Lv30

Route 7
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Cubchoo Rattled 1% Lv30 - Lv35 Watchog Analytic 4% Lv30 - Lv35 Zangoose Toxic Boost 7.5% Lv30 - Lv35 Seviper Infiltrator 7.5% Lv30 - Lv35

Route 13 - By the stairs near the entrance to Giant Chasm
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Skorupi Keen Eye 1% Lv35 - Lv40 Tangela Regenerator 4% Lv35 - Lv40 Foongus Regenerator 15% Lv35 - Lv40

Route 13 - By the stairs on the west side of the route
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Moon Stone 0.25% Sun Stone 0.25% Shiny Stone 0.25% Dusk Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Spheal Oblivious 1% Lv35 - Lv40 Drifloon Flare Boost 4% Lv35 - Lv40 Foongus Regenerator 15% Lv35 - Lv40

Route 9
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Bouffalant Soundproof 1% Lv35 - Lv40 Muk Poison Touch 2% Lv35 - Lv40 Garbodor Aftermath 2% Lv35 - Lv40 Liepard Prankster 15% Lv35 - Lv40

Giant Chasm Crater
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Ditto Imposter 1% Lv45 - Lv50 Sneasel Pickpocket 2% Lv45 - Lv50 Metang Light Metal 2% Lv45 - Lv50 Clefairy Friend Guard 15% Lv45 - Lv50

Route 22
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Mienfoo Reckless 1% Lv40 - Lv45 Pelipper Rain Dish 4% Lv40 - Lv45 Amoonguss Regenerator 15% Lv40 - Lv45

Route 23
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Gligar Immunity 1% Lv50 - Lv55 Golduck Swift Swim 2% Lv50 - Lv55 Absol Justified 2% Lv50 - Lv55 Zangoose Toxic Boost 7.5% Lv50 - Lv55 Seviper Infiltrator 7.5% Lv50 - Lv55

Abundant Shrine - Near a Youngster on the east side of the area
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Vulpix Drought 1% Lv35 - Lv40 Bronzor Heavy Metal 4% Lv35 - Lv40 Amoonguss Regenerator 15% Lv35 - Lv40

Abundant Shrine - East of the shrine by a pond
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Moon Stone 0.25% Sun Stone 0.25% Shiny Stone 0.25% Dusk Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Swablu Cloud Nine 1% Lv35 - Lv40 Golduck Swift Swim 4% Lv35 - Lv40 Amoonguss Regenerator 15% Lv35 - Lv40

Pinwheel Forest
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Murkrow Prankster 1% Lv55 - Lv60 Breloom Technician 3.75% Lv55 - Lv60 Butterfree Tinted Lens 4% Lv55 - Lv60 Beedrill Sniper 4% Lv55 - Lv60 Amoonguss Regenerator 11.25% Lv55 - Lv60

Outer Pinwheel Forest
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Poliwhirl Swift Swim 1% Lv55 - Lv60 Hariyama Sheer Force 1% Lv55 - Lv60 Medicham Telepathy 1% Lv55 - Lv60 Bagon Sheer Force 3% Lv55 - Lv60 Hariyama Sheer Force 15% Lv55 - Lv60 Medicham Telepathy 15% Lv55 - Lv60

Route 3 - On the east side by the dark grass
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Zebstrika Sap Sipper 1% Lv55 - Lv60 Manectric Minus 4% Lv55 - Lv60 Pachirisu Volt Absorb 15% Lv55 - Lv60

Route 3 - By the northern shore of the pond (Requires Surf)
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Dawn Stone 1% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Lombre Own Tempo 1% Lv55 - Lv60 Venonat Run Away 4% Lv55 - Lv60 Bibarel Moody 15% Lv55 - Lv60

Route 2
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Granbull Rattled 1% Lv55 - Lv60 Nidoran F Hustle 2% Lv55 - Lv60 Nidoran M Hustle 2% Lv55 - Lv60 Watchog Analytic 15% Lv55 - Lv60

Route 18
Location	Items (40%)	Hidden Items (40%)
	Item Frequency Fire Stone 0.25% Water Stone 0.25% Thunderstone 0.25% Leaf Stone 0.25% Max Repel 1% Hyper Potion 1% Ultra Ball 2% Super Repel 2.5% Super Potion 2.5% Great Ball 5% Repel 6.25% Potion 6.25% Poké Ball 12.5%	Item Frequency Rare Candy 0.25% PP Max 0.25% PP Up 0.5% Red Shard 1% Blue Shard 1% Yellow Shard 1% Green Shard 1% Big Mushroom 2.5% Growth Mulch 6.25% Damp Mulch 6.25% Stable Mulch 6.25% Gooey Mulch 6.25% TinyMushroom 7.5%
Pokemon (20%)
Pokemon Hidden Ability Frequency Level Range Dragonite Multiscale 1% Lv55 - Lv60 Chatot Big Pecks 4% Lv55 - Lv60 Kingler Sheer Force 7.5% Lv55 - Lv60 Corsola Regenerator 7.5% Lv55 - Lv60

How Do You Get a Thunderstone in Pokemon Black 2

Source: http://www.psypokes.com/bw2/hiddengrotto.php

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