About

The National Pokédex contains 1025 species across 9 generations. Selecting one at random without bias requires a uniform distribution over the integer range [1, 1025]. This generator uses the browser's cryptographic RNG (crypto.getRandomValues) to produce an unbiased index, then fetches the canonical dataset from PokeAPI v2. Each result includes base stats (HP, Attack, Defense, Sp. Atk, Sp. Def, Speed), typing, abilities, height, weight, and official artwork. The base stat total (BST) ranges from 175 (Chansey) to 720 (Arceus); stat bars are normalized against the theoretical maximum of 255 per stat.

Randomizers are used in Nuzlocke challenge preparation, team-building exercises, fan art prompts, and competitive draft leagues. A flawed RNG can cluster results around popular species. This tool guarantees equal probability: each Pokémon has exactly a 11025 ≈ 0.0976% chance per roll. Results are cached locally so previously seen Pokémon load instantly on revisit, even offline.

Formulas

A uniform random Pokémon ID is generated over the closed interval [1, 1025]:

id = floor(cryptoRand() × 1025) + 1

where cryptoRand() produces a value in [0, 1) using crypto.getRandomValues. Each stat bar width is computed as a percentage of the species maximum:

barWidth = stat255 × 100%

where stat ∈ {HP, Attack, Defense, Sp.Atk, Sp.Def, Speed} and 255 is the absolute maximum any single base stat can reach. The base stat total is:

BST = 6∑i=1 stat_i

where stat_i is each of the six base stats. BST is the primary metric for comparing raw power across species.

Reference Data

Generation	Region	ID Range	Count	Intro Year	Notable Pokémon
I	Kanto	1 - 151	151	1996	Pikachu, Mewtwo, Charizard
II	Johto	152 - 251	100	1999	Lugia, Tyranitar, Celebi
III	Hoenn	252 - 386	135	2002	Rayquaza, Gardevoir, Blaziken
IV	Sinnoh	387 - 493	107	2006	Garchomp, Lucario, Arceus
V	Unova	494 - 649	156	2010	Reshiram, Zekrom, Zoroark
VI	Kalos	650 - 721	72	2013	Greninja, Xerneas, Yveltal
VII	Alola	722 - 809	88	2016	Mimikyu, Solgaleo, Lunala
VIII	Galar	810 - 905	96	2019	Dragapult, Zacian, Eternatus
IX	Paldea	906 - 1025	120	2022	Koraidon, Miraidon, Meowscarada
Total			1025	-	-

Frequently Asked Questions

The generator covers all 1025 Pokémon from Generation I (Kanto) through Generation IX (Paldea), using official National Pokédex numbering. Each species has an equal 11025 probability of appearing per roll.

PokeAPI sources artwork from the official Pokémon media assets. Occasionally, very recently added species or alternate forms may lack high-resolution artwork in the API. The generator falls back to the default front sprite (96×96px) when the HD image is unavailable.

BST is the sum of all six base stats. Competitively, Pokémon with BST above 600 are generally classified as pseudo-legendaries or legendaries. A BST below 400 typically indicates an unevolved or intentionally weak species. Note that BST does not account for type matchups, abilities, or movepool depth.

Yes. The generator provides optional filters for generation (I through IX) and all 18 types. When a filter is active, the random ID is drawn only from the filtered subset. Combining both filters narrows the pool further - for example, Generation I Fire types yields only 12 candidates.

Partially. Previously generated Pokémon are cached in LocalStorage (up to 50 entries). If you lose connectivity, the generator can re-display any cached Pokémon. New random rolls require an active connection to PokeAPI.

The generator uses crypto.getRandomValues instead of Math.random. The Web Crypto API draws from the operating system's entropy pool (e.g., /dev/urandom on Linux), producing cryptographically secure pseudo-random numbers. This eliminates the modulo bias present in naive implementations.