You've got two types of animators here, basically: the ones doing straight-up recreations of the first
Pokémon opening's iconic shots, and the ones with... different ideas.
Inspired by the similar Moon Animate Make-Up project, Pokémon ReAnimated comes from an Canada-based group of 32 animators, headed up by Spencer Moreland, who also edited the whole thing, and who hopes that this just the first of many projects the group will do.
Here's the video. It's mildly NSFW because of one particular scene 25 seconds in, where we see Ash Ketchum's animated buttocks for around one second: