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", 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. Moving to undiscovered 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. Additionally, when 2 chests in the same dungeon are opened, all chest tiles are revealed. When 4 chests are opened, the entire dungeon is revealed, but each chest opened will also increase the HP of all encounters in the dungeon by 20%.
 * 5) A trainer - Trainers are found on tiles and have teams of Pokémon that must all be defeated to progress. Each Pokémon yields  Pokédollars.
 * 6) * Note: A Wild Pokémon is approximately 4 times more likely to appear on an enemy tile than a trainer.

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 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.

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