What it says about them
Each Pokémon's page says what its page in the game's Pokédex says, and the rest comes from the game too: its base
stats, when it evolves, the moves it learns, how hard they hit, the type chart its battles use, and how it's trained. So the match-ups here
are the game's. Its battles are simpler than Red and Blue's: each Pokémon has one type, and each move has one
number for its power, with Red and Blue's accuracy, hits in a row and turns spent charging folded in.
The balls you tap are only in this browser, on this device: nothing is sent anywhere.
Where they come from
The sprites are the work of the PMD Sprite Collaboration 's
artists, who share them under CC BY-NC 4.0 . Each
Pokémon's own page (tap it) names the artists who made its regular and shiny sprites. Thank you, all of you.
What Catch 151 changed
Colours are rounded to the Knomi screen's 16-bit colour, and a pixel that was partly see-through is now either solid or clear.
They play 1.4 times slower than the originals, which felt rushed on a pet, with no frame shorter than 70 ms and at most 24 frames a view.
Only some of each sheet is kept: the animations facing you, the walk in its eight directions, and standing, attacking and hurt from behind, taken from the sheet's view from the back and right.
Each frame stands on its own feet instead of where it sits in its frame. A few are placed by hand: Ivysaur and Venusaur stand on their legs when they face you, Diglett and Dugtrio sit lower in their mounds, and Blastoise and Magikarp lie lower when asleep.
They're the versions packed for the game. SpriteCollab keeps improving its sprites, so some there may be newer.
What it added
Turn: the Pokédex entry's turn, made from the first frame of the walk in each of its eight directions, 250 ms each.
Battle: the attack seen from behind, the way your own Pokémon fights.
A shiny's four twinkling gold sparkles, and the shadow under each Pokémon. Neither is part of the sprites.
Using them
Get the original sheets from SpriteCollab (each Pokémon's page here links to its own), credit their artists, and
don't use them commercially. Pokémon and its names, designs and characters are © Nintendo, Game Freak and The Pokémon
Company. This is an unofficial, non-commercial fan project, not affiliated with any of them.