Dungeons

Dungeons include forests, caves, buildings, and other places that are accessible by spending Dungeon Tokens in which wild Pokémon are encountered. Apart from the entrance fee, they differ from routes in that only 60 seconds are given to find and defeat a "Boss Pokémon" or "Boss Trainer", after which the dungeon is considered cleared.

How to clear
Clearing Dungeons requires active play. To enter a dungeon, select it on the Town Map and either click "Start" or press the Spacebar on the keyboard. Dungeons can be navigated either by clicking on the dungeon tiles or by using the arrow keys or WASD keys. Only unexplored tiles adjacent to explored tiles can be accessed. Moving to unexplored tiles in dungeons can reveal one of 4 things:
 * 1) Empty tiles - You can simply move onto next tile without having to do anything.
 * 2) A Wild Pokémon - Just like routes, these are Pokémon you can defeat and catch. Some Pokémon can only be found in specific dungeons.
 * 3) Dungeon boss - This Pokémon must be defeated to clear the dungeon. It has more HP than normal encounters in any dungeon. You can either click "Start Bossfight" or press the Spacebar to start the fight.
 * 4) A chest - Battle Items can be collected from chests by clicking on them or by pressing the Spacebar.
 * 5) A trainer - Trainers are found on tiles and have teams of Pokémon that must all be defeated to progress. Wild Pokémon are almost always ~4 times more likely to appear on an enemy tile than a trainer, but in some dungeons this weighting is different. Defeating trainers yields the following rewards:
 * 6) * Dungeon Trainers reward 4% of the dungeon cost as Dungeon Tokens and 50% of the dungeon cost as Poké Dollars  whenever they are defeated.
 * 7) * Dungeon Trainer Bosses reward 10% of the dungeon cost as Dungeon Tokens and 100% of the dungeon cost as Poké Dollars  whenever they are defeated.

Dungeon Size Reduction
After clearing a Dungeon a number of times, certain perks are granted to the player in that Dungeon to make clearing it easier. With each Dungeon Achievement unlocked, the Dungeon size will shrink by 1 row and 1 column to a minimum of 5x5. For example, a Hoenn dungeon cleared 100 times will now be a 5x5 sized Hoenn Dungeon instead of the base 7x7 sized Hoenn Dungeon.

Flash Ability
A Dungeon that is cleared 200 times will unlock the Flash ability, which permanently reveals the contents of adjacent unexplored tiles.

Chests in Dungeons
When a number of chests equal to a third of the dungeon's size rounded down are opened (for example, 2 chests in a 6x6 dungeon), all chest tiles are revealed. When a number of chests equal to half the dungeon's size rounded up are opened, the entire dungeon is revealed. However, each chest opened will also increase the HP of all encounters in the dungeon by 20%.

Kanto
Dungeons in Kanto are 5x5 in size (25 tiles in total), contain 5 chests, 13 non-boss encounters, and 6 empty tiles.

Johto
Dungeons in Johto are initially 6x6 in size (36 tiles in total), contain 6 chests, 15 non-boss encounters, and 14 empty tiles.

Hoenn
Dungeons in Hoenn are 7x7 in size (49 tiles in total), contain 7 chests, 17 non-boss encounters, and 24 empty tiles.

Sinnoh
Dungeons in Sinnoh are 8x8 in size (64 tiles in total), contain 8 chests, 19 non-boss encounters, and 36 empty tiles.

Unova
Dungeons in Unova are 9x9 in size (81 tiles in total), contain 9 chests, 21 non-boss encounters, and 50 empty tiles.

Kalos
Dungeons in Kalos are 10x10 in size (100 tiles in total), contain 10 chests, 23 non-boss encounters, and 77 empty tiles.

Trivia
To complete all dungeon achievements, you would need following amount of Dungeon tokens