One of the first scenes from the Pokémon anime is a recreation of the opening from Red and Green. This scene of a Nidorino battling a Gengar begins precisely as it did in the games, complete with monochrome colors and limited animation. Then, it shifts into the style that would become standard for the rest of the series – vibrant colors, dynamic camera angles, and speedy movements. The anime presented Pokémon fans with the world of the games in ways they could only dream of, but it didn't stop at the battles. The characters, stories, music, and many other parts of the anime went beyond what it needed to do as an adaptation.
Source：https://www.cbr.com/is-the-pokmon-anime-less-creative-now/
